By “isolated” in {TAIL ~ reference} to a polypeptide is meant a polymer of 6, 12, 18 or more amino acids conjugated to each other, including polypeptides that are isolated from {HEAD ~ a natural source} or that are synthesized 
By “ isolated ” in { TAIL ~ reference } to a polypeptide is meant a polymer of 6 , 12 , 18 or more amino acids conjugated to each other , including polypeptides that are isolated from { HEAD ~ a natural source } or that are synthesized
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH