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, any one of a group of relatively small organic molecules required for the catalytic function of certain enzymes. A coenzyme may either be attached by covalent bonds to a particular enzyme or exist freely in solution, but in either case it participates intimately in
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group of organic substances that are required in the diet of humans and animals for normal growth, maintenance of life, and normal reproduction. Vitamins act as catalysts; very often either the vitamins themselves are coenzymes, or they form integral parts of coenzymes.
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(also called pyridoxol), vitamin B6. Pyridoxine is found in largest amounts in rice bran, beans, yeast, kidneys, liver, and muscles. Its structural formula is
In animal tissues, pyridoxine is converted into pyridoxal phosphate, an active coenzyme form of vitamin B6 A deficiency of pyridoxine in the diet gives rise to dermatitis and convulsions.