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Structural demonstration of key residues in salt bridges. SARS-CoV-2 S protein RBD (yellow) with human ACE2 binding domain (gray). Key residues are marked with its amino acid types, sequence numbers, and charges, where blue stands for positively charged amino acid and red stands for the negative ones. Four pairs of salt bridges are found by VMD. All the structures in this figure are rendered by Chimera.
