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Figure 3 | BMC Evolutionary Biology

Figure 3

From: Declining transition/transversion ratios through time reveal limitations to the accuracy of nucleotide substitution models

Figure 3

Estimates of ti / tv plotted against root-node age in a broad-scale analyses of DNA (n = 52) (black) and RNA (red) (n = 24) viruses. The points represent individual virus data sets and the lines represent the regressions. Solid circles correspond to data sets that passed the date-randomization test, whereas empty circles are those that failed the test.

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