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Cumulative distribution function for duplication sizes for the X and four major autosomal arms in (A) Drosophila yakuba and (B) D. simulans. The X chromosome in D. yakuba (red) is significantly different from all autosomes (
) due to a large number of small duplications 500 bp or less. Chromosome 2 R (blue) is also different from Chr2L and 3 R (
). In D. simulans, chromosome 3 L (green) is significantly different 2 L, 3 R, and the X.
