Immunogen sequence: VCARMIVLNNK FGLRCKNCKT NIHEHCQSYV EMQRCFGKIP PGFHRAYSSP LYSNQQYACV KDLSAANRND PVFET Highest antigen sequence identity to the following orthologs - mouse 91%, rat 95%. The Src homology 3 (SH3) domain is a highly conserved 60 amino acid