Immunogen sequence: NNLFTDTDLK SIVKNSASKS HAAEKLRSNK KREMDDVAIE DEVLEQLFKD TKPELEIDVK VQKQEEDVNV RKRPRMDIET NDTFSDEAVP ESSKISQENE IGKKRELKED SLWSAKEISN NDKLQDDSEM LPKKLLLTEF RSLVIKNSTS RNPSGINDDY GQLKNFKKFK KVTYPGAGKL PHIIGGSDLI AHHARKNTEL EEWLRQEMEV QNQ