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