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. 2018 Aug 16;8:12289. doi: 10.1038/s41598-018-30697-y

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© The Author(s) 2018

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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NMR characterization of arginine side chain interactions of the CXCL8 mutants with heparin dp8. Overlay of the Nε-Hε selective ¹H-¹⁵N HISQC spectra of the arginine side chains in the free (black) and heparin dp8-bound complexes (red). Arrows connect the respective free and bound peak. A schematic of arginine side chain is shown on the top and the side chain NεH resonance detected in the HISQC spectra is circled.