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