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