Preferably, the polymer has {HEAD ~ a molecular weight} in {TAIL ~ the range} of 100 Da to 800 kDa 
Preferably , the polymer has { HEAD ~ a molecular weight } in { TAIL ~ the range } of 100 Da to 800 kDa
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH