passages.id: split_4_test_250_passage
passages.type: progene_text
passages.text: Recently , mutation of glycine 2 , cysteine 3 , and lysines 7 and 9 was shown to block binding of Fyn to TCR zeta chain ITAMs , prompting the designation of these residues as an ITAM recognition motif ( Gauen , L.K.T. , M.E. Linder , and A.S. Shaw. 1996. J. Cell Biol. 133 : 1007 - 1015 ) .