passages.id: split_5_test_2430_passage
passages.type: progene_text
passages.text: Interestingly , the apparent defect in intrinsic kinase activity in vitro in the Y981F , Y952F , or Y928F mutant , but not the reduction in activity in the Y905F mutant , could be partially repaired or restored by c-Src or , more extensively , by v - Src , which promoted Y905 phosphorylation in trans .