Immunogen sequence: PKDEDYKQRT QKKAEVEGKD LPEHAVLKMK GNFTLPEVAE CFDEITYVEL QKEEAQKLLE QYKEESKKAL PPEKKQNTGS KKSNKNKSGK NQFNRGGGHR GRGGFNMRGG NFRGGAPGNR GGYNRRGNMP QRGGGGGGSG GIGYPYPRAP VFPGRGSYSN RGNYNRGGMP NRGNYNQNFR GRGNNRGYKN QSQGYNQWQQ GQFWGQKPWS QHY