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. 2020 Apr 6;10:5957. doi: 10.1038/s41598-020-62734-0

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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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Confocal (A) and SR-SIM (B,C) analyses of rod photoreceptor synapses in the OPL immunolabelled with rabbit polyclonal antibodies against RIBEYE and mouse monoclonal antibodies (16D9) against Cav1.4. From the immunolabelled ribbon/active zone complexes, quantitative parameters (length [central line of the ribbon in C, shown as an example] and area [outer line, surrounding the immunosignal in C, shown as an example]) were determined (D,E). In (F1), all synaptic ribbons were subdivided into distinct length classes and analyzed for the respective length of the associated active zone (as measured by the length of Cav1.4-immunosignals). In (F2), the ratio between ribbon length/Cav1.4 length is displayed. Values are plotted as mean ± S.E.M. In (D,E,F1,F2). Abbreviations: OPL, outer plexiform layer. Scale bars: 1 μm.