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Of Terms in Biology: Metabolomics and Metabonomics

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What is metabolomics? Oh, that's easy. It's the study of the metabolome. Very good. Now, what is the metabolome?

* the collection of all metabolites in a biological organism, which are the end products of its gene expression. (Source)
* the complete set of small-molecule metabolites (such as metabolic intermediates, hormones and other signalling molecules, and secondary metabolites) to be found within a biological sample, such as a single organism. (Source)

Ergo, metabolomics is the study of the complete collection of metabolites present in a cell or tissue under a particular set of conditions (= the metabolome) generating a biochemical profile. (Source) It's 'omics for the small molecules.

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