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