Immunogen sequence: MDSVEKGAAT SVSNPRGRPS RGRPPKLQRN SRGGQGRGVE KPPHLAALIL ARGGSKGIPL KNIKHLAGVP LIGWVLRAAL DSGAFQSVWV STDHDEIENV AKQFGAQVHR RSSEVSKDSS TSLDAIIEFL NYHNEVDIVG NIQATSPCLH PTDLQKVAEM IREEGYDSVF SVVRRHQFRW SEIQKGVREV TEPLNLNPAK RPRRQDWDGE LYE