Immunogen sequence: MSTGLRYKSK LATPEDKQDI DKQYVGFATL PNQVHRKSVK KGFDFTLMVA GESGLGKSTL VHSLFLTDLY KDRKLLSAEE RISQTVEILK HTVDIEEKGV KLKLTIVDTP GFGDAVNNTE CWKPITDYVD QQFEQYFRDE SGLNRKNIQD NRVHCCLYFI SPFGHGLRPV DVGFMKALHE KVNIVPLIAK ADCLVPSEIR KLKERIREEI DKF