{TAIL ~ The term} does not imply that {HEAD ~ the sequence} is the only amino acid chain present, but that it is essentially free of material naturally associated with it 
{ TAIL ~ The term } does not imply that { HEAD ~ the sequence } is the only amino acid chain present , but that it is essentially free of material naturally associated with it
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH