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The effects of the introduction of 2',5'-phosphodiester linkages within a h
ammerhead ribozyme domain have been examined in order to determine the regi
ons which can be modified without impairing the cleavage activity and wheth
er a substrate analogue, containing a 2',5'-linkage at the scissile positio
n, could be cleaved. (C) 1999 Elsevier Science Ltd. All rights reserved.