Immunogen sequence: RDPLQGKKYV QKDGHHCCLK CFDKFCANTC VECRKPIGAD SKEVHYKNRF WHDTCFRCAK CLHPLANETF VAKDNKILCN KCTTREDSPK CKGCFKAIVA GDQNVEYKGT VWHKDCFTCS NCKQVIGTGS FFPKGEDFYC VTCHETKFAK HCVKCNKAIT SGGITYQDQP WHADCFVCVT CSKKLAGQRF TAVEDQYYCV DCYKNFVAKK CAG