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It has been drawn to our attention that we inadvertently miscited work leading to the purification and cloning of the UV endonuclease from Micrococcus luteus. Reference 19 should have been to Piersen, C. E., Prince, M. A., Augustine, M. L., Dodson, M. L. & Lloyd, R. S. J. Biol. Chem. 270, 23475–23484 (1995).