Immunogen sequence: YQTRKKSEEY SVTNTDETVV PPDVPSYLSS QGTLSDRQET VVRTEGGPQA NGHIESNGVC PRDASHFPEP DTHSVACRQP KLCAGSAYHK EPWKAMEKAE GTPGPHKMEH GGRVVCSDCN TEVDCYSRGQ AFHPQPVSRD SAQPSAPNGP EPGGSDQEHS PHHQCSRTAA GSCPECQGSL YPSNHDRMLT AVKKKPMASL DGKGDSSWTL ARL