passages.id: split_4_test_606_passage
passages.type: progene_text
passages.text: Co - expression of a FLAG epitope - tagged form of DokR ( FLAG-DokR ) with Lyn in embryonic kidney 293T cells resulted in constitutive phosphorylation of FLAG-DokR on tyrosine residues and consequential physical association with RasGTPase - activating protein ( GAP ) and the Nck adaptor protein .