Immunogen sequence: RPEGGGGSAR PRYSLLAEIG RGSYGVVYEA VAGRSGARVA VKKIRCDAPE NVELALAEFW ALTSLKRRHQ NVVQFEECVL QRNGLAQRMS HGNKSSQLYL RLVETSLKGE RILGYAEEPC YLWFVMEFCE GGDLNQYVLS RRPDPATNKS FMLQLTSAIA FLHKNHIVHR DLKPDNILIT ERSGTPILKV A. The protein encoded by