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(a) The sketch of the interface model of the SARS-CoV-2 RBD bound to the ACE2 receptor. (b) The interface model between the RBM and α1, α2, β1 and β2 used in VASP relaxation. (c) Strong HBs likely to form between the RBM and α1 shown as green dots. Key residues are labeled and shown in sticks. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
