Immunogen sequence: SELNHVKVTS EALGHAGRHL QQIILDQCYN FVCVNVTTSD FQETQKLLSM LEESSLCILY PVVVVSVHFL DFKLVPPSQK MENLMQ Highest antigen sequence identity to the following orthologs: Mouse - 56%, Rat - 58%. Required for protein O-linked mannosylation. Probably