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| Modern Genetic Analysis Chapter 7. Gene Mutations The Molecular Basis of Mutation Figure 7-27. Skin cancer in xeroderma pigmentosum. This recessive hereditary disease is caused by a deficiency in one of the excision-repair enzymes, which leads to the formation of skin cancers on exposure of the skin to the UV rays in sunlight. (Photograph courtesy of Dirk Bootswa, Erasmus University, Rotterdam.)

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