Immunogen sequence: GPVTMEAERSK ATAVALGSFP AGGPAELSLR LGEPLTIVSE DGDWWTVLSE VSGREYNIPS VHVAKVSHGW LYEGLSREKA EELLLLPGNP G Highest antigen sequence identity to the following orthologs - mouse 84%, rat 84%. Adapter protein, which negatively regulates T-cel