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. 2023 Oct 1;11(10):1557. doi: 10.3390/vaccines11101557

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© 2023 by the authors.

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/).

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Amino acid sequence alignment of the nine RBD variants investigated in this study (alignment made with https://www.ebi.ac.uk/Tools/msa/clustalo/ (accessed on 28 September 2023)).