Immunogen sequence: PPPMNFTDLL RLAEKKQFEP VEIKVVKKSE ERPMTAEELR EREFLERKHR RKKLETDGKL PPTVSKKAPS QKESVGTK Highest antigen sequence identity to the following orthologs: Mouse - 82%, Rat - 79%. Histone chaperone that stabilizes pre-existing histone tetrame