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. 2021 Aug 19;69(6):496–519. doi: 10.1007/s12026-021-09224-1

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© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 1 — CaATP_NAI domains of S protein among SARS-CoV-2, SARS, and MERS; YP_009724390.1 is the S protein of SARS-CoV-2. ACB69883.1 is the S protein of SARS-CoV. AMO03401.1 is the S protein of MERS. This figure is drawn by ENDscript server [124]