Immunogen sequence: GASAGALTAT ALVTGVCLGE AGAKFIEVSK EARKRFLGPL HPSFNLVKII RSFLLKVLPA DSHEHASGRL GISLTRVSDG ENVIISHFNS KDELIQANVC SGFIPVYCGL IPPSLQGVRY VDGGISDNLP LYELKNTITV SPFSGESDIC PQDSSTNIHE LRVTNTSIQF NLRNLYRLSK ALFPPEPLVL REMCKQGYRD GLRFLQRNGL LNR