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