Immunogen sequence: QLDALLVFPG QVAQLSCTLS PQHVTIRDYG VSWYQQRAGS APRYLLYYRS EEDHHRPADI PDRFSAAKDE AHNACVLTIS PVQPEDDADY YCSVGYGFSP Highest antigen sequence identity to the following orthologs: Mouse - 69%, Rat - 58%. Associates with the Ig-mu chain to for