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The fraction of perfect inverted repeats are shown for the S. cerevisiae (blue), RA (red), and R (green) genomes, respectively. The error bars here represent two standard deviations about the mean. The S. cerevisiae genome has a significantly greater proportion of perfect inverted repeats than either randomization. Because the scoring scheme of the IRF search algorithm only allows imperfections in IRs longer than 9 bp, the data are confined to this region
