passages.id: split_8_test_1582_passage
passages.type: progene_text
passages.text: The v-Src SH3 - binding sites were mapped to known proline - X-X-proline ( PXXP ) SH3 - binding motifs in the FAK N - ( residues 371 - 377 ) and C - terminal domains ( residues 712 - 718 and 871-882) by in vitro pull - down assays , and these sites are composed of a PXXPXXPhi ( where Phi is a hydrophobic residue ) v-Src SH3 binding consensus .