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. 2021 May 26;9(6):554. doi: 10.3390/vaccines9060554

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© 2021 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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Cytopathic signs observed in ExpiSf9^TM cells. (a) ExpiSf9^TM cells (×10). (b) Transfected ExpiSf9^TM cells (×10). (c) ExpiSf9^TM cells with visible signs of virus infection (× 40).