Immunogen sequence: ELVDFYRTTT IAKKRQIFLR DEEPLLKSPG ACFAQAQFDF SAQDPSQLSF RRGDIIEVLE RPDPHWWRGR SCGRVGFFPR SYVQPVHL. This gene encodes a member of the GRB2/Sem5/Drk family. This member functions as a cytoplasmic signaling protein which contains an SH2 d