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| Modern Genetic Analysis Chapter 7. Gene Mutations The Molecular Basis of Mutation Figure 7-21. Repair of a UV-induced pyrimidine photodimer by a photoreactivating enzyme, or photolyase. The enzyme recognizes the photodimer (here, a thymine dimer) and binds to it. When light is present, the photolyase uses its energy to split the dimer into the original monomers. (After J. D. Watson, Molecular Biology of the Gene, 3d ed. Copyright © 1976 by W. A. Benjamin).

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