Immunogen sequence: MSQAVQTNGT QPLSKTWELS LYELQRTPQE AITDGLEIVV SPRSLHSELM CPICLDMLKN TMTTKECLHR FCADCIITAL RSGNKECPTC RKKLVSKRSL RPDPNFDALI SKIYPSRDEY EAHQERVLAR INKHNNQQAL SHSIEEGLKI QAMNRLQRGK KQQIENGSGA EDNGDSSHCS NASTHSNQEA GPSNKRTKTS DDSGLELDNN NAA