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In page Proteomics:

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In the past this phenomenon was assessed by RNA analysis, which was found to lack correlation with protein content.[2][3] It is now known that mRNA is not always translated into protein,[4] and the amount of protein produced for a given amount of mRNA depends on the gene it is transcribed from and on the cell's physiological state. Proteomics confirms the presence of the protein and provides a direct measure of its quantity.[citation needed]