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