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Histogram of the linker length distribution in the five phyla considered. Horizontal axis labels indicate length intervals: 20 corresponds to 0–20, 30 (21–30), 40 (31–40), 50 (41–50), 60 (51–60) and >60 (longer than 60 residues). Gray scale corresponds to different phyla as indicated in the box inserted in the plot. Percentage (%) on the vertical axis indicates the fraction of linkers in the length interval.
