Immunogen sequence: AELPPVPGGP RGPGELAKYG LPGLAQLKSR ESYVLCYDPR TRGALWVVEQ LRPERLRGDG DRRECDFRED DSVHAYHRAT NADYRGSGFD RGHLAAAANH RWSQKAMDDT FYLSNVAPQV PHLNQNAWNN LEKYSRSLTR SYQNVYVCTG PLFLPRTEAD GKSYVKYQVI GKNHVAVPTH FFKVLILEAA GGQIELRTYV MPNAPVDEAI PLE