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In page Arabidopsis thaliana:

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The genome encodes ~27,600 protein-coding genes and about 6,500 non-coding genes.[7] However, the Uniprot database lists 39,342 proteins in their Arabidopsis reference proteome.[8] Among the 27,600 protein-coding genes 25,402 (91.8%) are now annotated with "meaningful" product names,[9] although a large fraction of these proteins is likely only poorly understood and only known in general terms (e.g. as "DNA-binding protein without known specificity"). Uniprot lists more than 3,000 proteins as "uncharacterized" as part of the reference proteome.[citation needed]