Immunogen sequence: KESQRSGNVA ELALKATLVE SSTSGFTPGG GGSSVSMIAS RKPTDGASSS NCVTDISHLV RKKRKPEEES PRKDDAKKAK QEPEVNGGSG DAVPSG Highest antigen sequence identity to the following orthologs: Mouse - 96%, Rat - 95%. NASP encodes a H1 histone binding protein