Immunogen sequence: QKLPKGKRPN LKVHINTTSD SILLKFLRPS PNVKLEGLLL GYGSNVSPNQ YFPLPAEGKF TEAIVDAEPK YLIVVRPAPP PSQKKSCSGK TRSRKPLQLV VGTLTPSSVF LSWGFLINPH HDWTLPSHCP NDRFYTIRYR EKDKEKKWIF QICPATETIV ENLKPNTVYE FGVKDNVEGG IWSKIFNHKT VVGSKKVNGK IQSTYDQDHT VPA