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Syntenic organization of the achaete–scute locus in representative insects. The D. melanogaster ac–sc locus, which is used as a reference, is arbitrarily limited to 12 genes with specific colours. Single-copy genes depicted with colour combinations in other species mean that duplication(s) of this gene occurred in the lineage leading to the Diptera. Yellow bar: gene duplications specific to D. melanogaster; red star: loss of asense.
