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