Figure 3.

Origin and evolutionary history of newly identified CoVs. A. the position of 2019-nCoV in the context of all reference CoVs. The phylogeny is constructed based on ORF1b protein alignment. For clarity, names were only shown for human-associated viruses. Bat associated diversity is shaded with blue and green boxes for alpha- and beta-CoVs respectively. B. genome structure of newly identified viruses and its sequence similarity against bat-SL-CoVZC45 and SARS-CoV in a 1000bp sliding window across the entire genome. Recombination breakpoints are shown as dashed vertical lines. C. the relationship of WHU viruses with the other SARS-like CoVs. Phylogeny is reconstructed based on the nucleotide sequence of four genes: namely 1a, 1b, S, and N. Those grouped with WHU at S gene are marked red, and those grouped with SARS CoVs at S gene are marked blue.