Immunogen sequence: CGELVWVGEP LTLRTAETIT GKYGVWMRDP KPTYPYTQET TWRIDTVGTD VRQVFEYDLI SQFMQGYPSK VHILPRPLES TGAVVYSGSL YFQGAESRTV IRYELNTETV KAEKEIPGAG YHGQFPYSWG GYTDIDLAVD EAGLWVIYST DEAKGAIVLS KLNPENLELE QTWETNIRKQ SVANAFIICG TLYTVSSYTS ADATVNFAYD TGT