Immunogen sequence: KKKVKNGLHS KVVSEQKDTL GNTQIKQKSR PGNKGKFVTK DQANCRWAAT EQEEGISLKV ECTQLDHEFS CVFAGNPTSC LKLKDERVYW KQVARNLRSQ KDICRYSKTA VKTRVCRKDF PESSLKLVSS TLFGNTKPRK EKTEMSPREH IKGKETTPSS LAVTQTMATK APECVEDPDM ANQRKTALEF CGETWSSLCT FFLSIVQDTS C;