Immunogen sequence: MTMLLDGGPQ FPGLGVGSFG APRHHEMPNR EPAGMGLNPF GDSTHAAAAA AAAAAFKLSP AAAHDLSSGQ SSAFTPQGSG YANALGHHHH HHHHHHHTSQ VPSYGGAASA AFNSTREFLF RQRSSGLSEA ASGGGQHGLF AGSASSLHAP AGIPEPPSYL LFPGLHEQGA GHPSPTGHVD NNQVHLGLRG ELFGRADPYR PVASPRTDPY AAG