Immunogen sequence: RPTCKRMKIS HQRDGLTNAG ELESDSGSDK ANSPAGGIPS TSSCLPSPST PVQSPHPQFP HISSTMNGTS NSPSGNHQSS FANRPRKSSV NGSSATSSG. Component of the Polycomb group (PcG) multiprotein PRC1 complex, a complex required to maintain the transcriptionally repres