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[19] The enzymes that use B 12 as a built-in cofactor are methylmalonyl-CoA mutase (PDB 4REQ [43] ) and methionine synthase (PDB 1Q8J)

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Nicotinamide riboside kinases regulate skeletal muscle fiber-type specification and are rate-limiting for metabolic adaptations during regeneration

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For the 96.4% of adults without deficiency, however, injections offer no performance advantage despite marketing claims suggesting otherwise
