Immunogen sequence: GLEHGFEKPL DSAMSAEEDT DVRGRRKKKT PRKAEDTREN RKLENKNAFL EKKTVPKKQR NQDRSKSAAE LEKLMPVSAQ TPKGRRLSGE ERGLWSTDSA EEDKETKRNE SKE Highest antigen sequence identity to the following orthologs: Mouse - 56%, Rat - 58%. Heterochromatin compone