{HEAD ~ The method} of identifying {TAIL ~ nucleic acids}, preferably associated with other functional units, which have the facilitative activity described herein is termed Chemi SELEX 
of identifying
{ HEAD ~ The method } of identifying { TAIL ~ nucleic acids } , preferably associated with other functional units , which have the facilitative activity described herein is termed Chemi SELEX
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH