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. 2021 Jan 29;12:696. doi: 10.1038/s41467-021-20992-0

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© The Author(s) 2021

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. 4 — a Sequences of Pep4-Br-X-Br containing two BrvG residues separated by different spacer regions (X). b Sequence of Pep5-Br-Br containing two successive BrvG residues. c, d Synthesis of peptides containing two oxazole moieties. EICs of m/z values corresponding to the precursors and the expected products with two Oxz are shown. Additional EICs used to monitor these reactions are shown in Supplementary Fig. 6.