Immunogen sequence: GNSASNIVSP QEALPGRKEQ TPVAAKHHVN GNRTVEPFPE GTQMAVFGMG CFWGAERKFW VLKGVYSTQV GFAGGYTSNP TYKEVCSEKT GHAEVVRVVY QPEHMSFEEL LKVFWENHDP TQGMRQGNDH GTQYRSAIYP TSAKQMEAAL SSKENYQKVL SEHGFGPITT DIREGQTFYY AEDYHQQYLS KNPNGYCGLG GTGVSCPVGI KK;