passages.id: split_8_test_1341_passage
passages.type: progene_text
passages.text: Further evidence for the absence of surface c-mpl - del was that in contrast to cells transfected with c-mpl - wt , those transfected with c-mpl - del did not grow in response to TPO , failed to undergo tyrosine phosphorylation of TPO - specific signal molecules , and did not bind(125)I - rHuTPO .