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. 2021 Dec 30;11:24507. doi: 10.1038/s41598-021-04298-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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NanoSpot adaptation to emerging SARS-CoV-2 variants. (a) SyproRuby-stained SDS PAGE of ~ 20 µg of NanoSpike N501Y, which was expressed in Expi293F cells and purified by one-step affinity purification. Protein yield from 25 ml of Expi293F-cell cultures was 2.5 mg. Defined amounts of BSA are shown for comparison. (b) Hemagglutination assay based on samples from a convalescent COVID-19-patient that was treated with indicated proteins. Three dilutions of the serum and three time points were used to reveal potential differences in agglutination activity.