Immunogen sequence: DTTQSLKQLE ERAARNVSQV SKNLESHHGD QMAQKSQSTQ ISQELEELRA EQQRLKSQDL ELSWNLNGLQ ADLSSFKSQE LNERNEASDL LERLREEVTK LRMELQVSSG FVCNTCPEKW INFQRKCYYF GKGTKQWVHA RYACDDMEGQ LVSIHSPEEQ DFLTKHASHT GSWIGLRNLD LKGEFIWVDG SHVDYSNWAP GEPTSRSQGE DCV