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Orphan gene content in six aquatic mammals. (A) Whole genome sizes of the six mammalian species and the six plant species (data from NCBI). (B) Orphan gene content (as a percentage of total genes) for aquatic mammals and land plants. (C) The correlation of orphan gene content as percentage of total genes and Numt turnover %. Correlation coefficient = –0.48; P = 0.31. The amount of orphan genes in mammal species is not significantly correlated with their Numt content.
