Immunogen sequence: KYSLGSITSP SPISSPTFSP IEFQIGETPL SEQRKFTVHS PDASSGTNSN GITNPCIRSP YIDGCSPIKN WSPMRLQMYS GGTQYRTSVI QIPFTLETQG EDEEDKENIP STDVSSPAMD AAGIHLRQFS NEASTHGTHL VVTAMSVTQN QSSASEKELA LLQDVEREKD NNTVDMVDPI EIADETTWIK EPVDNGSLPM TDFVSGIAFS IEN