Immunogen sequence: MPGGKKVAGG GSSGATPTSA AATAPSGVRR LETSEGTSAQ RDEEPEEEGE EDLRDGGVPF FVNRGGLPVD EATWERMWKH VAKIHPDGEK VAQRIRGATD LPKIPIPSVP TFQPSTPVPE RLEAVQRYIR ELQYNHTGTQ FFEIKKSRPL TGLMDLAKEM TKEALPIKCL EAVILGIYLT NSMPTLERFP ISFKTYFSGN YFRHIVLGVN FAG