Immunogen sequence: PIGRCMCKAG FEAVENGTVC RGCPSGTFKA NQGDEACTHC PINSRTTSEG ATNCVCRNGY YRADLDPLDM PCTTIPSAPQ AVISSVNETS LMLEWTPPRD SGGREDLVYN IICKSCGSGR GACTRCGDNV QYAPRQLGLT EPRIYISDLL AHTQYTFEIQ AVNGVTDQSP FSPQFASVNI TTNQAAPSAV SIMHQVSRTV DSITLSWSQP DQP