Immunogen sequence: MATVTATTKV PEIRDVTRIE RIGAHSHIRG LGLDDALEPR QASQGMVGQL AARRAAGVVL EMIREGKIAG RAVLIAGQPG TGKTAIAMGM AQALGPDTPF TAIAGSEIFS LEMSKTEALT QAFRRSIGVR IKEETEIIEG EVVEIQIDRP ATGTGSKVGK LTLKTTEMET IYDLGTKMIE SLTKDKVQAG DVITIDKATG KISKLGRSFT RAR