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DescriptionOrtholog paralog analog examples.svg
English: Top: An ancestral gene duplicates to produce two paralogs (histone H1.1 and 1.2). A speciation event produces orthologs in the two daughter species (human and chimpanzee). Bottom: in a separate species (E. coli), an gene has a similar function (histone-like nucleoid-structuring protein) but has a separate evolutionary origin and so is an analog.
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