{HEAD ~ A preferred protein} is an enzyme such as thermolysin, {TAIL ~ elastase}, asparaginase, lysozyme, lipase or urease 
such as
{ HEAD ~ A preferred protein } is an enzyme such as thermolysin , { TAIL ~ elastase } , asparaginase , lysozyme , lipase or urease
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH