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A graphical summary of the base pair occurrence frequencies within each base pair family, obtained from rRNA sequence data (data from Supplementary Table S8). For cWW, tHH, tWH, tHS, tWS and tSS, one base combination accounts for >50% of instances. The gray boxes in each matrix indicate base combinations that do not form that type of base pair. For example, there is no GG cWW base pair.
