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  • substance that is essential for the proper metabolism and regulation of body processes; vitamins were so named because they were though [thought] originally to contain an amine radicle, which is incorrect
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • Organic substances that cannot be produced in the body but are essential for cellular functions and must be obtained from the diet.
    Source: Biotechnology Glossary

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