passages.id: split_1_test_2661_passage
passages.type: progene_text
passages.text: In this study we describe abrogation of IL-7 driven proliferation and attenuated phosphotyrosine signaling by IL-7 (143) ( Trp-Ala ) and IL-7 (143) ( Trp-His ) in IL-7R expressing T and B leukemia cells .