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Tests of temporal structure in WNV. (A) Root-to-tip genetic divergence (on the ML phylogeny against year of sampling) for the complete WNV data set. The P values for the linear regression and the R2 values are indicated. (B) Tip-date randomization for data subset A (300 sequences). Ten independent tip-date randomizations were performed and run in BEAST together with the “true” data set (left-most point).
