Immunogen sequence: MEAGEEPLLL AELKPGRPHQ FDWKSSCETW SVAFSPDGSW FAWSQGHCIV KLIPWPLEEQ FIPKGFEAKS RSSKNETKGR GSPKEKTLDC GQIVWGLAFS PWPSPPSRKL WARHHPQVPD VSCLVLATGL NDGQIKIWEV QTGLLLLNLS GHQDVVRDLS FTPSGSLILV SASRDKTLRI WDLNKHGKQI QVLSGHLQWV; Positive Samp