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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The conserved amino acid sequences and 3D structures of the Mpro catalytic domains for different coronaviruses. (A) Alignment of neighbor residues on both flanks of the pivotal residue His41, Cys145. (B) The three-dimensional (3D) structures of Mpro are highly conserved.