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Scheme of N-protein domains and variable amino acid residues characterizing five different variants of the SARS-CoV-2 virus used in this work. The locations of the functional domains of the N protein are given according to [9]. The substitutions present in the N-protein sequences of the B.1.351 (brown), P.1 (green), B.1.617.2 (magenta) and B.1.1.529 (red) strains are indicated with arrows.
