Immunogen sequence: PKAYPDNHLS QVDVNELFSK LLKTGILKLS QTDSATTQVS EVTAQPPPEE EEDQNEDQDV PDLTNFTVEE LKQRYDSVIN RLYTGIQCYS CGMRFTTSQT DVYADHLDWH YRQNRTEKDV SRKVTHRRWY YSLTDWIEFE EIADLEERAK SQFFEKVHEE VVLKTQEAAK EKEFQSVPAG PAGAVESCEI CQEQFEQYWD EEEEEWHLKN AIR