USMLE Step 1 Quiz
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BIOCHEMISTRY
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A 39-year-old woman with a history of severe alcoholism and malnutrition presents with deep cracks and fissures at the corners of her mouth and a painful, smooth, magenta-colored tongue. She also complains of greasy, scaling dermatitis in the nasolabial folds. An eye examination reveals corneal vascularization.
This patient's symptoms are characteristic of a deficiency of a vitamin that serves as a precursor for cofactors required by which of the following enzymes?
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