Lengths of scaffolds in prokaryotic genomes that contain or consist entirely of human repeats. (A) Histogram showing the number of scaffolds of a given length that contain human repeats. (B) The coverage depth of contaminant scaffolds is on average 30 times lower than the average genome coverage (red box). Similar-sized scaffolds in the same assemblies do not show the same trend (gray box). Wilcoxon signed-rank test, P < 2.2 × 10⁻¹⁶.