Immunogen sequence: MENKSLESSQ TDLKLVAHPR AKSKVWKYFG FDTNAEGCIL QWKKIYCRIC MAQIAYSGNT SNLSYHLEKN HPEEFCEFVK SNTEQMREAF ATAFSKLKPE SSQQPGQDAL AVKAGHGYDS KKQQELTAAV LGLICEGLYP ASIVDEPTFK VLLKTADPRY ELPSRKYIST KAIPEKYGAV REVILKELAE ATWCGISTDM WRSENQNRAY VTL