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• Riboflavin deficiency: Dietary deficiency of riboflavin (vitamin B2). • Riboflavin deficiency: 7,8-dimethyl-10-ribitylisoalloxazine: a heat-stable factor of the water-soluble vitamin B complex whose isoalloxazine nucleotides are coenzymes of the flavodehydrogenases. Its principal forms in tissues and cells are as FMN and FAD.
