Immunogen sequence: PLSCSYVLTI RTPRLCPHPL LRPPPSAAPQ AILCHPSLQP EEYMAYVQRQ ADSKQYGDKI IEELQDLGPQ VWSETKSGVA PQKMAGASPT KDDSKDSDFW KML Highest antigen sequence identity to the following orthologs: Mouse - 66%, Rat - 70%. OS9 is an ER glycoprotein found in