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Structure of SARS-CoV-2 spike protein (PDB ID: 6VYB (Walls et al., 2020). A) Spike homotrimer in open conformation. B) Cleavage sites on spike protein (marked by arrows). Red cartoon, S1; light/dark blue cartoon, S2; dark blue cartoon, S2′). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
