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Number of clustered overrepresented mitochondrion-related genes (GO:0005739; at enrichment scores >2) per nonoverlapping dN/dS bin. Lower dN/dS values indicate evidence suggestive of purifying selection, whereas higher dN/dS values indicate evidence suggestive of positive selection. The clustered mitochondrion-related genes are present in higher dN/dS bins in the human and elephant lineages and in lower bins in mouse and tenrec lineages.
