Immunogen sequence: VRSLLGLSNS EPNGSVETKN LEQILNGGES PKQKGQEIKR SSGDVLETFN FLENADDSDE DEENDMIEGI PEGKDKHRMN KHKIGNEGLA ADLTDDPDTE EALKEFDFLV TAEDGEGAGE ARSSGDGTEW DKDDLSPTAE VWDVDQGLIS KLKEQYKKER KGKKGVKRAN RTKLYDMIAD LGDDELPHIP SGIINQSRSA STRMTDHEGA RAE