Immunogen sequence: WDHFWLNEGH TVYLERHICG RLFGEKFRHF NALGGWGELQ NSVKTFGETH PFTKLVVDLT DIDPDVAYSS VPYEKGFALL FYLEQLLGGP EIFLGFLKAY VEKFSYKSIT TDDWKDFLYS YFKDKVDVLN QVDWNAWLYS PGLPPIKPNY DMTLTNACIA LSQRWITAKE DDLNSFNATD LKDLSSHQLN EFLAQTLQRA PLPLGHIKRM QEV