Detection of {TAIL ~ an increase} in fluorescent signal indicates the presence of {HEAD ~ the enzyme} in the sample 
Detection of { TAIL ~ an increase } in fluorescent signal indicates the presence of { HEAD ~ the enzyme } in the sample
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH