Immunogen sequence: VPNGSALTDG SQLPSRDSSG TAVAPENRHQ PPSTNCFGGR SRTHRHSGAS ARTTPATGEQ SPGARSRHRQ PVKNSGHSGL ANGTVNDEPT TATDPEEPSV VGVTSPPAAP LSVTPNPNTT SLPAPATPAE GEEPSTSGTQ QLPAAAQAPD ALPAGWEQRE LPNGRVYYVD HNTKTTTWER PLPPGWEKRT DPRGRFYYVD HNTRTTTWQR PTA