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(A). The surface representation of the three-dimensional structure of human SARS-CoV-2 spike protein (PDB code: 7KRQ) showing; A-chain (green), B-chain (cyan), C-chain (magenta) and with the invariant residues mapped on to it. (B). Only invariant residues are shown as spheres and labelled. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
