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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/).
Characteristic mutations (present in more than 75% of the analyzed sequences) of variants of concern of SARS-CoV-2, as of 31 December 2021 (GISAID database).