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Superposition of complexes on spike models reveals accessibility of sybodies. Superposition of (A) Sb16-RBD (slate) on spike (6XEY: 3-down; 6Z43: 1-up and 2-down; 7A29: 2-up and 1-down; 7JVC: 3-up); (B) Sb45-RBD (cyan); and (C) Sb68-RBD (purple), there is no accessible surface for Sb68 on 3-down of spike; (D) Sb68 and Sb16 on RBD; (E) SB68 and Sb45 on RBD.
