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Homologous genes databases

Orthology an paralogy at several phylogenic level

Comparison of homologous biological sequences is an essential step in molecular biology and evolution studies as molecular evolution, phylogeny of species, function prediction, identification of region of interest in genomes, etc.
In this view, several databases have been developped dedicated to different taxonomic levels : Hovergen for all vertebrates genes, Homolens for genes from animal complete genomes, Hogenom for genes form all complete genomes.