Immunogen sequence: LQELCQSTLTE MESQKQLCRP LTCEKSKPVP LKLFTPRLVK VLEFGRKQGS SKEEQERKRL IHKHKREFKG AVREIRKDNQ FLARMQLSEI MER Highest antigen sequence identity to the following orthologs - mouse 91%, rat 90%. Involved in nucleolar processing of pre-18S rib