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. 2020 May 1;11:2139. doi: 10.1038/s41467-020-15975-6

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© The Author(s) 2020

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. 1 — a Schematic representation of synthesis of mega HPGs (M_w: 1.3–9.3 MDa) by a macroinitiator approach in combination with solvent-based ring-opening multibranching polymerization. b ¹H NMR and c ¹³C IG NMR characterization confirmed the structural features of the mega HPG-3. d Gel permeation chromatography analysis shows the monomodal distribution of mega HPG-3. e Formation of single particles and globular shape of mega HPG-3 was confirmed by cryo-SEM.