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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/).
pH dependences of Gibbs free energy at the association of the S-protein (in trimeric form) of the wild-type strain (green curve W) and the omicron variant (red curve O) to the ACE2 receptor of the human epithelial cells receptor.