Precursor

:This article is not about the fictional alien race. See Precursor (Star Control). for that information

Biology

In biological processes especially metabolism, a precursor is a substance from which another, usually more active or mature substance is formed.

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For instance, certain liver enzymes are precursors to insulin. Or, this is the opposite of the body breaking down a more complex substance, like protein into individual chemicals for use within the body.

Related Topics:
Liver - Enzymes - Insulin - Protein

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