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(A–C). Top face of the ribbon diagram of the homotrimeric spike of SARS-CoV (PDB code 6ACD) (A), MERS-CoV (PDB code 5W9H) (B), and SARS-CoV-2 (PDB code 6VXX) (C). High-mannose glycans and complex glycans are colored cyan. Molecular surfaces corresponding to the RBDs are colored gold and the remaining molecular surfaces are colored grey.
