Immunogen sequence: VCKVQEQIFN LYTKLLEQER VSGVPSSCSS SSLENMLLFN SPSVGPDAPK IEDLKWHSAF FRKQMGTSLV HSLKKPHKRD PLQNSPGSEG KTLLKQPDL Highest antigen sequence identity to the following orthologs: Mouse - 84%, Rat - 86%. Scaffold subunit of some HBO1 complexes