The nucleic acid ligands of {HEAD ~ the present invention} consist of {TAIL ~ at least one nucleic acid region} and not necessarily, but preferably at least one functional unit 
The nucleic acid ligands of { HEAD ~ the present invention } consist of { TAIL ~ at least one nucleic acid region } and not necessarily , but preferably at least one functional unit
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH