Enzyme Catalysis, Cofactors & Regulation | USMLE Step 1
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A 46-year-old man with alcohol use disorder has eaten little solid food for several months. He has persistent diarrhea, a painful red tongue, and a rough, hyperpigmented rash over his forearms and the V-shaped area of his upper chest. The rash is most prominent after outdoor work. Nutritional treatment includes replacement of the vitamin most directly associated with this pattern.