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Different S-trimer conformations. PDB accession numbers: 6 VXX, 6 XRA, 6 VXX, 6 VYB, and 6 X2B from left to right. (A) S-trimer models in prefusion and postfusion forms. (B) S-trimer models with different RBD forms. S-monomers with closed RBDs are shown in blue, and open RBDs are shown in red.
