Immunogen sequence: MGPKDSAKCL HRGPQPSHWA AGDGPTQERC GPRSLGSPVL GLDTCRAWDH VDGQILGQLR PLTEEEEEEG AGATLSRGPA FPGMGSEELR LASFYDWPLT AEVPPELLAA AGFFHTGHQD KVRCFFCYGG LQSWKRGDDP WTEHAKWFPS CQFLLRSKGR DFVHSVQETH SQLLGSWDPW EEPEDAAPVA PSVPASGYPE LPTPRREVQS ESA