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Flexibility of the spike bound to the ACE2 receptor. A) Schematic representation of the two-parallel-membrane system of the spike-ACE2 complex. (B–E) Distributions of the ankle, knee, hip and spike-tilting angles resulting from MD replicas 1–3 (darker color) and 4–6 (lighter color). Starting points for replicas 4–6 have been selected using DeepDriveMD.
