Immunogen sequence: MTENSTDHPK YSDMIVAAIQ AEKNRAGSSR QSIQKYIKSH YKVGENADSQ IKLSIKRLVT TGVLKQTKGV GASGSFRLAK SDEPKKSVAF KKTKKEIKKV ATPKKASK Highest antigen sequence identity to the following orthologs: Mouse - 93%, Rat - 39%. Histones are basic nuclear pr