Immunogen sequence: AHLCLYNLSVI HKKKYFDSEL ELMTYINENW DRLHPGELAD TPKSERYEHV LEALNDYKTM FMSGKEI Highest antigen sequence identity to the following orthologs - mouse 100%, rat 99%. Polycomb group (PcG) that specifically binds histone H3 trimethylated at 'L