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. 2021 Jun 21;4:762. doi: 10.1038/s42003-021-02253-4

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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. 2 — a Comparison of the size of HER2 complexes after treatment with the bipDARPin 6L1G (32 kDa) with those obtained with growth factor heregulin (HRG, 27 kDa), monovalent DARPins (9.26 and G3, ~12 kDa each) or a bivalent, monoparatopic DARPin (GL4G, ~30 kDa). Primary antibodies against HER2 and DARPins were used. b Crosslinked HER2 complexes upon treatment with antibodies trastuzumab (TZB, ~145 kDa) and pertuzumab (PZB, ~145 kDa), detected by primary antibodies against HER2 and human IgG.