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Estimation of the time to the most recent common ancestor for HCoV-OC43 genotypes. The time-scaled phylogeny was summarized from all MCMC phylogenies of the S and N gene data set, which were analyzed under the relaxed-clock model with an uncorrelated exponential distribution in BEAST (version 1.6.1). A, genotype A; B, genotype B; C, genotype C. Genotype D strains are in boldface.
