diff --git "a/demonstrations/mumjycr/axtrees/page-21-0.json" "b/demonstrations/mumjycr/axtrees/page-21-0.json"
new file mode 100644--- /dev/null
+++ "b/demonstrations/mumjycr/axtrees/page-21-0.json"
@@ -0,0 +1 @@
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It can be a major confidence-booster: Researchers have found that wearing red garments makes people feel more "}}]}, "properties": [], "parentId": "618", "childIds": [], "backendDOMNodeId": 919}, {"nodeId": "796", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "attractive", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "attractive"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "618", "childIds": ["989"], "backendDOMNodeId": 920, "browsergym_id": "a9817aa7-3a15-4470"}, {"nodeId": "797", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". 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On the flip side, according to one 2013 study, looking at red things might cause us to experience "}}]}, "properties": [], "parentId": "618", "childIds": [], "backendDOMNodeId": 922}, {"nodeId": "798", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "pain", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "pain"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "618", "childIds": ["990"], "backendDOMNodeId": 923, "browsergym_id": "b7488a2e-24c4-4e63"}, {"nodeId": "799", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " more intensely. 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You win some, you lose some."}}]}, "properties": [], "parentId": "618", "childIds": [], "backendDOMNodeId": 925}, {"nodeId": "800", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Maybe red wouldn't ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Maybe red wouldn't "}}]}, "properties": [], "parentId": "619", "childIds": [], "backendDOMNodeId": 928}, {"nodeId": "801", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "provoke our brains", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "provoke our brains"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "619", "childIds": ["991"], "backendDOMNodeId": 929, "browsergym_id": "a465c324-d005-4738"}, {"nodeId": "802", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " so much if it didn't happen to be the color of human ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " so much if it didn't happen to be the color of human "}}]}, "properties": [], "parentId": "619", "childIds": [], "backendDOMNodeId": 931}, {"nodeId": "803", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "blood", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "blood"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "619", "childIds": ["992"], "backendDOMNodeId": 932, "browsergym_id": "e9715e12-d836-4f74"}, {"nodeId": "804", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". 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From timber wolves to tiger "}}]}, "properties": [], "parentId": "619", "childIds": [], "backendDOMNodeId": 937}, {"nodeId": "807", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "sharks", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "sharks"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "619", "childIds": ["994"], "backendDOMNodeId": 938, "browsergym_id": "9a1377c3-b898-4646"}, {"nodeId": "808", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", most vertebrate animals have crimson blood in their veins. This hue is produced by hemoglobin, the protein that helps our blood distribute oxygen.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", most vertebrate animals have crimson blood in their veins. This hue is produced by hemoglobin, the protein that helps our blood distribute oxygen."}}]}, "properties": [], "parentId": "619", "childIds": [], "backendDOMNodeId": 940}, {"nodeId": "809", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In grade school, you probably learned that blood contains three types of cells. White blood cells \u2014 or leukocytes \u2014 help us fight off viruses, harmful bacteria and other pathogens. Then we've got platelets, the damage control specialists that allow our blood to clot. Last, but not least, are the red blood cells. Their main purpose in life is to carry ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In grade school, you probably learned that blood contains three types of cells. White blood cells \u2014 or leukocytes \u2014 help us fight off viruses, harmful bacteria and other pathogens. Then we've got platelets, the damage control specialists that allow our blood to clot. Last, but not least, are the red blood cells. 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A core ingredient in red blood cells, it binds to oxygen and carbon dioxide. Hemoglobin is partly made up of iron atoms, which give this protein \u2014 and by extension, our red blood cells \u2014 a crimson appearance. Since platelets and white blood cells are vastly outnumbered by reds, human blood itself looks red.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Hemoglobin lets them execute both tasks. A core ingredient in red blood cells, it binds to oxygen and carbon dioxide. Hemoglobin is partly made up of iron atoms, which give this protein \u2014 and by extension, our red blood cells \u2014 a crimson appearance. 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(Consequently, their tongues, muscles and bones are all various shades of green.)", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " blood. (Consequently, their tongues, muscles and bones are all various shades of green.)"}}]}, "properties": [], "parentId": "628", "childIds": [], "backendDOMNodeId": 1061}, {"nodeId": "829", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Like humans, the reptiles have hemoglobin-rich red blood cells. Such cells do not last forever, and when they break down (in our bodies as well as the lizards'), the green-pigmented waste product biliverdin is made. Most vertebrates filter this stuff out of their circulatory systems. For them, excess biliverdin can ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Like humans, the reptiles have hemoglobin-rich red blood cells. Such cells do not last forever, and when they break down (in our bodies as well as the lizards'), the green-pigmented waste product biliverdin is made. Most vertebrates filter this stuff out of their circulatory systems. For them, excess biliverdin can "}}]}, "properties": [], "parentId": "629", "childIds": [], "backendDOMNodeId": 1064}, {"nodeId": "830", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "harm", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "harm"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "629", "childIds": ["1013"], "backendDOMNodeId": 1065, "browsergym_id": "a5c9a945-ffbc-4b71"}, {"nodeId": "831", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " cells, neurons and DNA.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " cells, neurons and DNA."}}]}, "properties": [], "parentId": "629", "childIds": [], "backendDOMNodeId": 1067}, {"nodeId": "832", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Yet the ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Yet the "}}]}, "properties": [], "parentId": "630", "childIds": [], "backendDOMNodeId": 1070}, {"nodeId": "833", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "lizards", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "lizards"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "630", "childIds": ["1014"], "backendDOMNodeId": 1071, "browsergym_id": "1c38d6d1-8097-4353"}, {"nodeId": "834", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " have a level of biliverdin in their veins that would kill a human. Moreover, the pigment is so densely-concentrated that it overrides the hemoglobin and makes their blood look green.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " have a level of biliverdin in their veins that would kill a human. Moreover, the pigment is so densely-concentrated that it overrides the hemoglobin and makes their blood look green."}}]}, "properties": [], "parentId": "630", "childIds": [], "backendDOMNodeId": 1073}, {"nodeId": "835", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "On May 16, 2018, a ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "On May 16, 2018, a "}}]}, "properties": [], "parentId": "631", "childIds": [], "backendDOMNodeId": 1076}, {"nodeId": "836", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "paper", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "paper"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "631", "childIds": ["1015"], "backendDOMNodeId": 1077, "browsergym_id": "222d452b-23dc-4104"}, {"nodeId": "837", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " on the subject was published in the journal Science Advances. Its authors carried out a genetic survey of 51 different skinks in Australia, Asia and the islands between them. Six of the green-blooded New Guinea species were analyzed in the process. Turns out those biliverdin-loaded reptiles are not closely related to one other. In theory, they evolved green-bloodedness independently \u2014 and each of them is descended from red-blooded ancestors.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " on the subject was published in the journal Science Advances. Its authors carried out a genetic survey of 51 different skinks in Australia, Asia and the islands between them. Six of the green-blooded New Guinea species were analyzed in the process. Turns out those biliverdin-loaded reptiles are not closely related to one other. In theory, they evolved green-bloodedness independently \u2014 and each of them is descended from red-blooded ancestors."}}]}, "properties": [], "parentId": "631", "childIds": [], "backendDOMNodeId": 1079}, {"nodeId": "838", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Such an unusual trait would not have evolved six times over if it didn't offer some kind of benefit. But scientists have yet to identify the advantage of having green blood. Predators who eat the lizards don't get sick afterward, and the skinks are no better camouflaged than their biliverdin-deficient cousins. It's possible that the special blood helped their ancestors kill parasites, but more research will be needed to confirm or refute this.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Such an unusual trait would not have evolved six times over if it didn't offer some kind of benefit. But scientists have yet to identify the advantage of having green blood. Predators who eat the lizards don't get sick afterward, and the skinks are no better camouflaged than their biliverdin-deficient cousins. It's possible that the special blood helped their ancestors kill parasites, but more research will be needed to confirm or refute this."}}]}, "properties": [], "parentId": "632", "childIds": [], "backendDOMNodeId": 1082}, {"nodeId": "839", "ignored": false, "role": {"type": "internalRole", "value": "SvgRoot"}, "chromeRole": {"type": "internalRole", "value": 162}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "relatedElement", "nativeSource": "title"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "633", "childIds": ["1016"], "backendDOMNodeId": 1093, "browsergym_id": "848841c9-a2de-479a"}, {"nodeId": "840", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "633", "childIds": ["1017"], "backendDOMNodeId": 1096, "browsergym_id": "e449dbe3-0ff6-4cc4"}, {"nodeId": "841", "ignored": false, "role": {"type": "role", "value": "figure"}, "chromeRole": {"type": "internalRole", "value": 84}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [{"name": "details", "value": {"type": "idrefList", "value": "", "relatedNodes": [{"backendDOMNodeId": 1123}]}}], "parentId": "634", "childIds": ["1018", "1019", "1020"], "backendDOMNodeId": 1105, "browsergym_id": "ef694f4d-7603-49b9"}, {"nodeId": "842", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Named for their long, toothy snouts, crocodile icefish (of which ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Named for their long, toothy snouts, crocodile icefish (of which "}}]}, "properties": [], "parentId": "635", "childIds": [], "backendDOMNodeId": 1132}, {"nodeId": "843", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "16 species", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "16 species"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "635", "childIds": ["1021"], "backendDOMNodeId": 1133, "browsergym_id": "65194684-7279-49bc"}, {"nodeId": "844", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " have been recognized) live in the ocean waters around Antarctica. The extremophiles are built to thrive in conditions that would kill most other vertebrates. Crocodile icefish frequent brutally cold portions of the sea where the water temperature can plummet all the way down to 28.5 degrees Fahrenheit (1.9 degrees Celsius). That's below the point at which fresh water freezes.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " have been recognized) live in the ocean waters around Antarctica. The extremophiles are built to thrive in conditions that would kill most other vertebrates. Crocodile icefish frequent brutally cold portions of the sea where the water temperature can plummet all the way down to 28.5 degrees Fahrenheit (1.9 degrees Celsius). That's below the point at which fresh water freezes."}}]}, "properties": [], "parentId": "635", "childIds": [], "backendDOMNodeId": 1135}, {"nodeId": "845", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In extraordinarily cold water, red blood cells turn into a liability. Blood with a high percentage of these cells becomes dangerously thick and hard to circulate when the outside temperature gets too low. That's why fish who live in cold waters have proportionately ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In extraordinarily cold water, red blood cells turn into a liability. Blood with a high percentage of these cells becomes dangerously thick and hard to circulate when the outside temperature gets too low. 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It's astonishing!"}}]}, "properties": [], "parentId": "637", "childIds": [], "backendDOMNodeId": 1144}, {"nodeId": "849", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Now you might be thinking ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Now you might be thinking "}}]}, "properties": [], "parentId": "638", "childIds": [], "backendDOMNodeId": 1147}, {"nodeId": "850", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "638", "childIds": ["1023"], "backendDOMNodeId": 1148, "browsergym_id": "2c56f842-5e4f-4c30"}, {"nodeId": "851", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " To get the job done, they enlist the ocean itself. Cold water is naturally ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " To get the job done, they enlist the ocean itself. Cold water is naturally "}}]}, "properties": [], "parentId": "638", "childIds": [], "backendDOMNodeId": 1150}, {"nodeId": "852", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "richer in usable oxygen", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "richer in usable oxygen"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "638", "childIds": ["1024"], "backendDOMNodeId": 1151, "browsergym_id": "baaf9cad-408d-4b83"}, {"nodeId": "853", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " than warm water. Crocodile icefish absorb some of this oxygen directly from the ocean and send it into their blood streams. The blood itself is a ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " than warm water. Crocodile icefish absorb some of this oxygen directly from the ocean and send it into their blood streams. The blood itself is a "}}]}, "properties": [], "parentId": "638", "childIds": [], "backendDOMNodeId": 1153}, {"nodeId": "854", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "colorless liquid", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "colorless liquid"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "638", "childIds": ["1025"], "backendDOMNodeId": 1154, "browsergym_id": "4165d378-ae52-4582"}, {"nodeId": "855", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", a fact that really surprised the discoverer of these fish, biologist Ditlef Rustad, when he dissected one in 1928. So abundant is the cold water ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", a fact that really surprised the discoverer of these fish, biologist Ditlef Rustad, when he dissected one in 1928. So abundant is the cold water "}}]}, "properties": [], "parentId": "638", "childIds": [], "backendDOMNodeId": 1156}, {"nodeId": "856", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "oxygen", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "oxygen"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "638", "childIds": ["1026"], "backendDOMNodeId": 1157, "browsergym_id": "053291dc-e21e-4721"}, {"nodeId": "857", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " that, upon absorption, it doesn't need to hitch a ride on red blood cells to get around. 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Yet many spineless creatures use an alternative protein: Hemocyanin.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Hemoglobin is a key ingredient in the circulatory systems of nearly all vertebrate animals. Yet many spineless creatures use an alternative protein: Hemocyanin."}}]}, "properties": [], "parentId": "641", "childIds": [], "backendDOMNodeId": 1209}, {"nodeId": "862", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Both are capable of binding to and transporting oxygen. But whereas hemoglobin contains iron atoms, hemocyanin incorporates copper. As a result, blood containing the latter protein looks markedly different from our human blood. When hemocyanin-rich blood becomes oxygenated, the copper ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Both are capable of binding to and transporting oxygen. But whereas hemoglobin contains iron atoms, hemocyanin incorporates copper. As a result, blood containing the latter protein looks markedly different from our human blood. 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", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The list of invertebrates that rely on hemocyanin instead of hemoglobin is a long one. "}}]}, "properties": [], "parentId": "643", "childIds": [], "backendDOMNodeId": 1218}, {"nodeId": "866", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Crustaceans", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Crustaceans"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "643", "childIds": ["1033"], "backendDOMNodeId": 1219, "browsergym_id": "af77fbd3-991e-4d3d"}, {"nodeId": "867", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " utilize the protein in their bloodstreams, as do ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " utilize the protein in their bloodstreams, as do "}}]}, "properties": [], "parentId": "643", "childIds": [], "backendDOMNodeId": 1221}, {"nodeId": "868", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "spiders and scorpions", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "spiders and scorpions"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "643", "childIds": ["1034"], "backendDOMNodeId": 1222, "browsergym_id": "58e8ad86-49e5-41d2"}, {"nodeId": "869", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". The roster also includes certain mollusks like everyone's favorite multi-armed brainiacs, the octopuses. Yes friends, octopuses \u2014 or if you prefer, \"", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". The roster also includes certain mollusks like everyone's favorite multi-armed brainiacs, the octopuses. Yes friends, octopuses \u2014 or if you prefer, \""}}]}, "properties": [], "parentId": "643", "childIds": [], "backendDOMNodeId": 1224}, {"nodeId": "870", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "octopi", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "octopi"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "643", "childIds": ["1035"], "backendDOMNodeId": 1225, "browsergym_id": "6871803b-d729-4e7c"}, {"nodeId": "871", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\" \u2014 have bluish blood. To make things even stranger, they've got three hearts with which to pump this liquid.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\" \u2014 have bluish blood. To make things even stranger, they've got three hearts with which to pump this liquid."}}]}, "properties": [], "parentId": "643", "childIds": [], "backendDOMNodeId": 1227}, {"nodeId": "872", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In oxygen-poor deep-sea environments, hemocyanin is ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In oxygen-poor deep-sea environments, hemocyanin is "}}]}, "properties": [], "parentId": "644", "childIds": [], "backendDOMNodeId": 1230}, {"nodeId": "873", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "better than hemoglobin", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "better than hemoglobin"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "644", "childIds": ["1036"], "backendDOMNodeId": 1231, "browsergym_id": "228f23d3-d131-40b7"}, {"nodeId": "874", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " at carrying precious oxygen through an animal's veins. Octopuses use the copper-laden protein to stay alive in some deep, cold and thoroughly anoxic waters. Additionally, hemocyanin helps the tentacled critters regulate the salt content of their blood so it matches that of the water they're swimming in.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " at carrying precious oxygen through an animal's veins. Octopuses use the copper-laden protein to stay alive in some deep, cold and thoroughly anoxic waters. Additionally, hemocyanin helps the tentacled critters regulate the salt content of their blood so it matches that of the water they're swimming in."}}]}, "properties": [], "parentId": "644", "childIds": [], "backendDOMNodeId": 1233}, {"nodeId": "875", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The setup is not without its drawbacks. 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Quite unwittingly, these marine invertebrates have become our allies in the endless fight against medical maladies. And it's all thanks to their wonderful blood. Despite the misleading common name, horseshoe crabs are not true crabs. They're more closely akin to ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " to the world's horseshoe crabs. Quite unwittingly, these marine invertebrates have become our allies in the endless fight against medical maladies. And it's all thanks to their wonderful blood. Despite the misleading common name, horseshoe crabs are not true crabs. They're more closely akin to "}}]}, "properties": [], "parentId": "648", "childIds": [], "backendDOMNodeId": 1292}, {"nodeId": "884", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "spiders", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "spiders"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "648", "childIds": ["1044"], "backendDOMNodeId": 1293, "browsergym_id": "3e5abf9c-15df-40ab"}, {"nodeId": "885", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " \u2014 and just like those arachnids, horseshoe crabs have blue blood filled with hemocyanin.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " \u2014 and just like those arachnids, horseshoe crabs have blue blood filled with hemocyanin."}}]}, "properties": [], "parentId": "648", "childIds": [], "backendDOMNodeId": 1295}, {"nodeId": "886", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "But there's something else in their blood, too. 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Not to worry: Evolution's given the hard-shelled creatures a different way to fight off disease-carrying microorganisms.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " roaming the ocean. Not to worry: Evolution's given the hard-shelled creatures a different way to fight off disease-carrying microorganisms."}}]}, "properties": [], "parentId": "649", "childIds": [], "backendDOMNodeId": 1301}, {"nodeId": "889", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Horseshoe crabs have moving cells inside their blood called amoebocytes. When one of these finds a bacterium, it secretes a rapidly-coagulating gel that encases the intruder. Known to scientists as ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Horseshoe crabs have moving cells inside their blood called amoebocytes. 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In it, a sample of the medicine is mingled with the invertebrate's azure blood. If any coagulogen clots appear within 45 minutes, then the researchers will know the drug contains (possibly harmful) bacteria. As such, it isn't ready to be used on human patients. To meet demand, some laboratories ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " to pass a contamination test involving horseshoe crab blood. In it, a sample of the medicine is mingled with the invertebrate's azure blood. If any coagulogen clots appear within 45 minutes, then the researchers will know the drug contains (possibly harmful) bacteria. As such, it isn't ready to be used on human patients. 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Brachiopods are ocean-dwelling animals that superficially resemble clams. They've got two articulated shells \u2014 or \"valves\" \u2014 apiece: One rests underneath the animal while the other covers it from above. Found in an assortment of marine habitats, the creatures filter tiny food particles out of the water. Although there are over 300 living species, most people associate brachiopods with prehistoric times because the hard-shelled creatures are disproportionately well-represented in much of the ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Fossil enthusiasts know all about these guys. Brachiopods are ocean-dwelling animals that superficially resemble clams. They've got two articulated shells \u2014 or \"valves\" \u2014 apiece: One rests underneath the animal while the other covers it from above. Found in an assortment of marine habitats, the creatures filter tiny food particles out of the water. 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That task is left to ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Extant brachiopods do not rely on hemoglobin or hemocyanin to ferry oxygen in the blood. 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Like hemoglobin, it contains ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", yet another pigmented protein. 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Nicknamed \"", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "You'll also see this kind of blood in Sipuncula marine worms. Nicknamed \""}}]}, "properties": [], "parentId": "656", "childIds": [], "backendDOMNodeId": 1384}, {"nodeId": "911", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "peanut worms", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "peanut worms"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "656", "childIds": ["1058"], "backendDOMNodeId": 1385, "browsergym_id": "f146d9ea-2b03-4feb"}, {"nodeId": "912", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\" due to their segmented appearance, the creepy crawlies reside in sand, mud, crevices and unoccupied shells among other places.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\" due to their segmented appearance, the creepy crawlies reside in sand, mud, crevices and unoccupied shells among other places."}}]}, "properties": [], "parentId": "656", "childIds": [], "backendDOMNodeId": 1387}, {"nodeId": "913", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Other ocean-going worms have a different circulatory setup. If a diver were to spot a live polychaete cruising through the waves, he or she might mistake it for a sentient feather-duster. Most of these worms are covered in bristles and tentacles whose function varies from species to species. ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Other ocean-going worms have a different circulatory setup. If a diver were to spot a live polychaete cruising through the waves, he or she might mistake it for a sentient feather-duster. Most of these worms are covered in bristles and tentacles whose function varies from species to species. 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