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. 2022 Aug 5;74(6):1315–1325. doi: 10.1007/s43440-022-00398-5

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© The Author(s) under exclusive licence to Maj Institute of Pharmacology Polish Academy of Sciences 2022

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. 2 — Purification of the recombinant RBD domain of the Spike protein from SARS-CoV-2. A Gel filtration (last step of the purification) of the recombinant RBD showing the Abs_280nm chromatogram. B The fractions were analyzed by 8% SDS-PAGE showing a band corresponding to the predicted MW of the monomer, and some light bands corresponding to an SDS-resistant oligomers (fraction a). RBD: receptor-binding domain; SDS-PAGE: Sodium Dodecyl Sulphate–Polyacrylamide Gel Electrophoresis; MW: molecular weight; kDa: kilo Daltons