The one or more purified polypeptides can be {HEAD ~ about 15 to about 75 amino acids} in {TAIL ~ length} 
in
The one or more purified polypeptides can be { HEAD ~ about 15 to about 75 amino acids } in { TAIL ~ length }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL