Immunogen sequence: RPTKEGGYGL KSYQPLMRLR HKQEKNQESS RVKGFMIQDG PFGSCENKYC GLGRHCVTSR ETGQAECACM DLCKRHYKPV CGSDGEFYEN HCEVHRAACL KKQKITIVHN EDCFFKGDKC KTTEYSKMKN MLLDLQNQKY IMQENENPNG DDISRKKLLV DQMFKYFDAD SNGLVDINEL TQVIKQEELG KDLFDCTLYV LLKYDDFNAD KHL