Immunogen sequence: STISSGRSTP AMMNGQGSTT SSSKNIAYNC CWDQCQACFN SSPDLADHIR SIHVDGQRGG VFVCLWKGCK VYNTPSTSQS WLQRHMLTHS GDKPFKCVVG GCNASFASQG GLARHVPTHF SQQNSSKVSS QPKAKEESPS KAGMNKRRKL KNKRRRSLPR PHDFFDAQTL DAIRHRAICF NLSAHIESLG KGHSVVFHST VIAKRKEDSG KIK