Immunogen sequence: NPATVPFVPI SGWHGDNMLE PSPNMPWFKG WKVERKEGNA SGVSLLEALD TILPPTRPTD KPLRLPLQDV YKIGGIGTVP VGRVETGILR PGMVVTFAPV NITTEVKSVE MHHEALSEAL PGDNVGFNVK NVSVKDIRRG NVCGDSKSDP PQEAAQFTSQ VIILNHPGQI SAGYSPVIDC HTAHIACKFA ELKEKIDRRS GKKLEDNPKS LKS