Immunogen sequence: TIRNYHKWLK NLKQEKEETQ VSITKRNTML EREIAFSIRD NFMQQKAFK Highest antigen sequence identity to the following orthologs: Mouse - 29%, Rat - 31%. XKRX (MIM 300684) and XKR3 are homologs of the Kell blood group precursor XK (MIM 314850), whi