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