Immunogen sequence: QGSSNEHGPV KRSSQSTLER SEQQIRAASS LEELLRITHS EDWKLWRCRL RLKSFTSMDS RSASHRSTRF AATFYDIETL KVIDEEWQRT QCSPRETCVE VASELGKSTN TFFKPPCVNV FRCGGCCNEE SLICMNTSTS YISKQLFEIS VPLTSVPELV PVKVANHTGC KCLPTAPRHP YSIIRRSIQI PEEDRCSHSK K; Positive Sa