{HEAD ~ The isolated polypeptides} of the present invention are unique in {TAIL ~ the sense} that they are not found in a pure or separated state in nature 
are unique in
{ HEAD ~ The isolated polypeptides } of the present invention are unique in { TAIL ~ the sense } that they are not found in a pure or separated state in nature
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH