Immunogen sequence: EASSPDYFGPP AKNGVAAEVS PAKEENPRRA SKAVEESSDE ERQRDLPAQR GEESSEEEEK GYKGKTRKKP VVKKQAPGKA SVSRKQA Highest antigen sequence identity to the following orthologs - mouse 41%, rat 43%. The HIRA protein shares sequence similarity with Hir1p