Immunogen sequence: MTGSNMSDAL ANAVCQRCQA RFSPAERIVN SNGELYHEHC FVCAQCFRPF PEGLFYEFEG RKYCEHDFQM LFAPCCGSCG EFIIGRVIKA MNNNWHPGCF RCELCDVELA DLGFVKNAGR HLCRPCHNRE KAKGLGKYIC QRCHLVIDEQ PLMFRSDAYH PDHFNCTHCG KELTAEAREL KGELYCLPCH DKMGVPICGA CRRPIEGRVV NAL