Immunogen sequence: MPKGKKAKGK KVAPAPAVVK KQEAKKVVNP LFEKRPKNFG IGQDIQPKRD LTRFVKWPRY IRLQRQRAIL YKRLKVPPAI NQFTQALDRQ TATQLLKLAH KYRPETKQEK KQRLLARAEK KAAGKGDVPT KRPPVLRAGV NTVTTLVENK KAQLVVIAHD VDPIELVVFL PALCRKMGVP YCIIKGKARL GRLVHRKTCT TVAFTQVNSE DKG