Immunogen sequence: MAAVLKPVLL GLRDAPVHGS PTGPGAWTAS KLGGIPDALP TVAAPRPVCQ RCGQPLALVV QVYCPLEGSP FHRLLHVFAC ACPGCSTGGA RSWKVFRSQC LQVPEREAQD AQKQGNSLAA EDWCEGADDW GSDTEEGPSP QFTLDFGNDA SSAKDVDWTA RLQDLRLQDA VLGAAHPVPP GLPLFLPYYI CVADEDDYRD FVNLDHAHSL LRD