{TAIL ~ Further processing} of {HEAD ~ the mature form} apparently occurs in some instances to yield biologically active fragments of the protein 
{ TAIL ~ Further processing } of { HEAD ~ the mature form } apparently occurs in some instances to yield biologically active fragments of the protein
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH