Immunogen sequence: MESEMETQSA RAEEGFTQVT RKGGRRAKKR QAEQLSAAGE GGDAGRMDTE EARPAKRPVF PPLCGDGLLS GKEETRKIPV PANRYTPLKE NWMKIFTPIV EHLGLQIRFN LKSRNVEIRT CKETKDVSAL TKAADFVKAF ILGFQVEDAL ALIRLDDLFL ESFEITDVKP LKGDHLSRAI GRIAGKGGKT KFTIENVTRT RIVLADVKVH ILG