Immunogen sequence: TGGKGCVKVW DISHPGNKSP VSQLDCLNRD NYIRSCKLLP DGCTLIVGGE ASTLSIWDLA APTPRIKAEL TSSAPACYAL AISPDSKVCF SCCSDGNIAV WDLHNQTLVR QFQGHTDGAS CIDISNDGTK LWTGGLDNTV RSWDLREGRQ LQQHDFTSQI FSLGYCPTGE WLAVGMESSN VEVLHVNKPD KYQLHLHESC VLSLKFAYCG KWF