Genome evolution: gene history repeats itself.
Pereira
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D042931:Aldehyde Oxidase / Q000235:genetics; D000818:Animals; D001419:Bacteria / Q000235:genetics; D019143:Evolution, Molecular; D020440:Gene Duplication; D016678:Genome; D007448:Invertebrates / Q000235:genetics; D010944:Plants / Q000235:genetics; D012641:Selection, Genetic; D014714:Vertebrates / Q000235:genetics; D014968:Xanthine Dehydrogenase / Q000235:genetics
D014968:Xanthine Dehydrogenase; D042931:Aldehyde Oxidase