Fig. 1.

a) The similarity of the S protein between the SARS-CoV-2 and SARS-CoV, bat SARS-like CoV and bat-nCoV as analyzed by 100aa segments alignment; b) The different regions identified in the similarity analysis were mapped on the SARS-CoV-2 S protein trimer predicted by the SWISS-model server: region aa1-400 is depicted in blue, region aa401-500 is depicted in red, region 501-600 is depicted in cyan, region aa601-700 is depicted in hot pink, and the C-terminal region starting from aa701 is depicted in yellow.