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1. A low-molecular-weight biological compound that is usually synthesized by an enzyme.
2. A compound that is essential for a metabolic process. A substance synthesized by the organism, or taken in from the environment. Autotrophic organisms take in inorganic metabolites, such as water, CO2, nitrates and some trace elements.
Publication Source: Food and Agricultural Organization of the United Nations (FAO)
Publication Date: 1999
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