passages.id: split_1_test_1549_passage
passages.type: progene_text
passages.text: In this cell line , 15-LO-1 expression , by RT - PCR and western blotting , was observed following 6 and 24 h of exposure to human IL-13 ( ED50 5 ng / ml ) and IL-4 ( ED50 0.2 ng / ml ) .