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