Immunogen sequence: MTQAEIKLCS LLLQEHFGEI VEKIGVHLIR TGSQPLRVIA HDTGTSLDQV KKALCVLVQH NLVSYQVHKR GVVEYEAQCS RVLRMLRYPR YIYTTKTLYS DTGELIVEEL LLNGKLTMSA VVKKVADRLT ETMEDGKTMD YAEVSNTFVR LADTHFVQRC PSVPTTENSD PGPPPPAPTL VINEKDMYLV PKLSLIGKGK RRRSSDEDAA GEP