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. 2020 May 20;11:2601. doi: 10.1038/s41467-020-16505-0

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Hartley guinea pigs were immunized on Day 0 with 100 µg INO-4800 or pVAX-empty vector as described in the methods. a SARS-CoV-2 S protein antigen binding of IgG in serial serum dilutions at day 0 and 14. Data shown represent mean OD450 nm values (mean + SD) for the five guinea pigs. b Serum IgG binding titers (mean ± SD) to SARS-CoV-2 S protein at day 14. Values depicted are mean ± SD. P values determined by Mann–Whitney test.