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