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MCMC tree of the 739-nt region of the E1 sequences of genotype 1E rubella viruses throughout the world visualized in FigTree. The width of a branch reflects the evolutionary rate of individual sequences and their reconstructed ancestors. Genotype 1E rubella viruses from China recovered from 2001 to 2009 segregated into 2 clusters (clusters 1 and 2). Chinese genotype 1E viruses were named according to WHO standard nomenclature.
