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An 8-year-old boy is brought to the physician by his parents because of photosensitivity. A review of his records shows that he has had multiple melanomas removed over his lifetime. The defective protein in this patient leads to an impairment of repair processes involving which of the following types of nucleotides?
A. Adenosine
B. Cytidine
C. Guanosine
D. Thymidine
E. Uracil
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