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. 2024 Feb 1;13(2):90. doi: 10.3390/biology13020090

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© 2024 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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Dissociation constant $K_{D}$ for XBB descendant variants. A higher value of $K_{D}$ determines a stronger binding affinity. Note that EG.5.1 has the greatest binding affinity to the ACE2 receptor.