Immunogen sequence: MPRAQPSSAS YQPVPADPFA IVSRAQQMVE ILSDENRNLR QELEGCYEKV ARLQKVETEI QRVSEAYENL VKSSSKREAL EKAMRNKLEG EIRRMHDFNR DLRERLETAN KQLAEKEYEG SEDTRKTISQ LFAKNKESQR EKEKLEAELA TARSTNEDQR RHIEIRDQAL SNAQAKVVKL EEELKKKQVY VDKVEKMQQA LVQLQAACEK REQ