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Identification of genes showing evidence of positive selection in two genera of spadefoots. ω values for genes showing significantly different selection between sequenced Spea and Scaphiopus species. Genes with a ω >= 2 (horizontal dashed line) were considered as putatively under positive selection in this study. We found more genes (n = 22) that met these criteria in Spea than in Scaphiopus (n = 4). Significant genes are labeled by their closest match in the SWISSprot database.
