Immunogen sequence: MAAGGGGGSS KASSSSASSA GALESSLDRK FQSVTNTMES IQGLSSWCIE NKKHHSTIVY HWMKWLRRSA YPHRLNLFYL ANDVIQNCKR KNAIIFRESF ADVLPEAAAL VKDPSVSKSV ERIFKIWEDR NVYPEEMIVA LREALTSTNP KAALKSKIVA EFRSQALIEE LLLYKRSEDQ IELKEKQLST MRVDVCSTET LKCLKDKTGG KKF