Immunogen sequence: MALLRGVFVV AAKRTPFGAY GGLLKDFTAT DLSEFAAKAA LSAGKVSPET VDSVIMGNVL QSSSDAIYLA RHVGLRVGIP KETPALTINR LCGSGFQSIV NGCQEICVKE AEVVLCGGTE SMSQAPYCVR NVRFGTKLGS DIKLEDSLWV SLTDQHVQLP MAMTAENLAV KHKISREECD KYALQSQQRW KAANDAGYFN DEMAPIEVKT KKG