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RBCs carry (I) high concentrations of antioxidant molecules, including glutathione (GSH) and vitamins such as ascorbic acid (vitamin C) and -tocopherol (vitamin E), (II) sources of reduced equivalents such as NADH and NADPH, and (III) antioxidant enzymes, including SOD1, Cat, GPx, and the thioredoxin (Trx) system, as described in detail below

The authors emphasize the importance of considering B12 deficiency in patients, especially those with conditions like anorexia, where nutritional deficiencies are common

Append modifier 59 only when documentation confirms the services were separate and no more specific modifier applies

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