{TAIL ~ The method} of this invention takes advantage of the method for identifying nucleic acid ligands referred to as {HEAD ~ SELEX} 
{ TAIL ~ The method } of this invention takes advantage of the method for identifying nucleic acid ligands referred to as { HEAD ~ SELEX }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD