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Vertebrate SoxE genes (Sox8, 9, and 10) are key regulators of neural crest cell (NCC) development. These genes arose by duplication from a single SoxE gene in the vertebrate ancestor. Although SoxE paralogs are coexpressed early in NCC development, later, Sox9 is restricted to skeletogenic lineages in the head, and Sox10 to non-skeletogenic NCC in the trunk and head. When this subfunctionalization...