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Corrections Hammerhead Ribozyme Mechanism: A Ribonucleotide 5′ to the Substrate Cleavage Site Is Not Essential, by Anilkumar R. Kore and Fritz Eckstein*, Volume 38, Number 34, August 24, 1999, pages 10915-10918. Page 10918. The following sentence should be added to the end of the Discussion: This has been observed for the HH 16 ribozyme previously but not discussed in the light of the X-ray structure or other 2′-modifications (19). Also, the following should be included in the References: 19. Hertel, K. J., Peracchi, A., Uhlenbeck, O. C., and Herschlag, D. (1997) Proc. Natl. Acad. Sci. U.S.A. 94, 8497-8502. BI995098C 10.1021/bi995098c Published on Web 01/25/2000