Immunogen sequence: PRDSPRAISF KNGWQMARQN AEIWSSTEET VSPKIKSRSC DDLLNDDCDS FPDPKVKSES MGSLLCEEDS KESCPMAWGS PYVPEVRSNG RSR Highest antigen sequence identity to the following orthologs: Mouse - 88%, Rat - 84%. Arg and c-Abl represent the mammalian members