Immunogen sequence: QWGNQETSNS GRGRVIQDAE ERPHSRYLRR AYSSDRSGTS NSQSQAKTYT MERCHSAEML SVSKRSGGGE NEERYSPTDN NANIFNFFKE KTSSSSGSFE. PLK4 or polo-like kinase 4 is a member of the polo family of serine/threonine protein kinases which localizes to centrioles