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Note also that the definition excludes protein complexes, which some also consider a protein. Those who wish to refer to a class representing both senses of the word are directed to PR:000064867 (\"protein-containing molecular entity\"). Proteins (in the sense defined here) that descended from a common ancestor can be classified into families and superfamilies composed of products of evolutionarily-related genes. The domain architecture of a protein is described by the order of its constituent domains. 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