Immunogen sequence: MTTQQIDLQG PGPWGFRLVG GKDFEQPLAI SRVTPGSKAA LANLCIGDVI TAIDGENTSN MTHLEAQNRI KGCTDNLTLT VARSEHKVWS PLVTEEGKRH PYKMNLASEP QEVLHIGSAH NRSAMPFTAS PASSTTARVI TNQYNNPAGL YSSENISNFN NALESKTAAS GVEANSRPLD HAQPPSSLVI DKESEVYKML QEKQELNEPP KQS