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. 2022 Jan 14;61(9):e202113617. doi: 10.1002/anie.202113617

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© 2021 Wiley‐VCH GmbH

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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Characteristics of 3MBP5 and its derivatives. a) Molecular structures and peptide sequences, b) high‐performance liquid chromatography (HPLC), and c) electrospray ionization mass spectrometry (ESI‐MS) analysis of 3MBP5, 3EBP5, BRP5, and BRM5 confirm that all the probes were prepared with at least 95 % purity. The orange peptide sequence represents M^pro binding and the cleavage fraction. The pink peptide sequence represents PL^pro binding and the cleavage fraction. The slash represents the protease cleavage site.