- The functional and morphologic fluctuation of cells in response to changing environmental conditions.
- Systematic variation in a characteristic (frequency, amplitude) of a sustained oscillation to code additional information.
- A change in the kinetics of an enzyme or metabolic pathway.
- The regulation of the rate of translation of mRNA by a modulating codon.
[L. modulor, to measure off properly]
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Examples: glitazone, GI cocktail, etc.