question: A protein-rich what leaks into spaces between cells?
choices.text: RNA kinase energy plasma fluid keratin cheese antigen
choices.label: A B C D E F G H
fact2: Lymph fluid is rich in protein.
combinedfact: A protein-rich fluid leaks into spaces between cells
formatted_question: A protein-rich what leaks into spaces between cells? (A) RNA (B) kinase (C) energy (D) plasma (E) fluid (F) keratin (G) cheese (H) antigen