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. 2021 Jan 12;11:821. doi: 10.1038/s41598-020-80896-9

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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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Inhibition of infection by influenza A virus (H1N1) HA/NA- or SARS-CoV-2 spike-pseudotyped viruses. Lentiviral pseudotypes bearing influenza A virus (H1N1) HA and NA proteins (black bars) or SARS-CoV-2 spike protein (gray bars) were prepared, in which a firefly luciferase-expressing plasmid was incorporated. They were preincubated with mock or increasing concentrations of λ-CGN for 2 h at 37 °C and then infected into Vero E6 cells. On day 2, relative firefly luciferase activity (RLU) was determined by fixing the mock-treated sample at 100%. Data are expressed as the mean ± S.D. of three independent experiments. ****P < 0.0001. The graph was created using GraphPad Prism 8.3.1 (www.graphpad.com).