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. 2021 Jan 21:1–9. doi: 10.1080/07391102.2021.1872418

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Figure 1. — A, throughout topology of spike functional regions. B, position of important domains in the 3D structure of spike. C, crystallized structure of spike protein and hACE2 complex. D, 2D schematic representation of important residues in spike interaction with its receptor (hydrogen bonds are displayed only).