OLIGONUCLEOTIDE STRUCTURAL PARAMETERS THAT INFLUENCE BINDING OF 5'-O-TRIPHOSPHOADENYLYL-(2'-]5')-ADENYLYL-(2'-]5')-ADENOSINE TO THE 5'-O-TRIPHOSPHOADENYLYL-(2'-]5')-ADENYLYL-(2'-]5')-ADENOSINE DEPENDENT ENDORIBONUCLEASE - CHAIN-LENGTH, PHOSPHORYLATION STATE, AND HETEROCYCLIC BASE