Immunogen sequence: MASSMRSLFS DHGKYVESFR RFLNHSTEHQ CMQEFMDKKL PGIIGRIGDT KSEIKILSIG GGAGEIDLQI LSKVQAQYPG VCINNEVVEP SAEQIAKYKE LVAKTSNLEN VKFAWHKETS SEYQSRMLEK KELQKWDFIH MIQMLYYVKD IPATLKFFHS LLGTNAKMLI IVVSGSSGWD KLWKKYGSRF PQDDLCQYIT SDDLTQMLDN LGL