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