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Percentage of gene externalization at ≥ 30% ID for the 382 prokaryotes in our data set. The proportion of externalized genes from Bacteria (green triangles) is significantly higher (Student’s t-test, p value < 10−16) than for Archaea (yellow dots), to the notable exception of Haloarchaea (red dots). It is moreover largely uncorrelated with genome size (regression lines with shaded confidence interval at 95%).
