Immunogen sequence: ATRFTLPRFL QRRSSRRKVC TKTFLGPRII GLRHEISVET QDHKSAVRGN NTHDNYENVE AGPPKAKGKT DKELYENTGQ SNFEEHIYGN ETSSDYYNFQ KPRPSEVPQD ED Highest antigen sequence identity to the following orthologs: Mouse - 55%, Rat - 55%. Negatively regulates B-c