In some embodiments of the methods, {TAIL ~ a mixture} comprising a sample and a substrate for {HEAD ~ the enzyme} is provided 
In some embodiments of the methods , { TAIL ~ a mixture } comprising a sample and a substrate for { HEAD ~ the enzyme } is provided
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH