No 08/117,991 entitled {TAIL ~ High Affinity Nucleic Acid Ligands} Containing {HEAD ~ Modified Nucleotides}, U.S. Ser 
No 08/117,991 entitled { TAIL ~ High Affinity Nucleic Acid Ligands } Containing { HEAD ~ Modified Nucleotides } , U.S. Ser
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH