Immunogen sequence: ANVLITRDGV LKLADFGLAR AFSLAKNSQP NRYTNRVVTL WYRPPELLLG ERDYGPPIDL WGAGCIMAEM WTRSPIMQGN TEQHQLALIS QLCGSITPEV WPNVDNYELY EKLELVKGQK RKVKDRLKAY VRDPYALDLI DKLLVLDPAQ RIDSDDALNH DFFWSDPMPS DLKGMLSTHL TSMFEYLAPP RRKGSQITQQ STNQSRNPAT TNQ