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Expansion of the leg1 gene family in three deep-sea Aulopiformes species. Three representative species of the Aulopiformes exhibit genes from the leg1 gene family ranging from 7 to 20, which is significantly higher than the other shallow-water fish species. Different colored squares represent different species, with numbers in parentheses indicating the gene copy number. The right panel shows the gene tree of the leg1 gene in various species.

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