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. 2020 Mar 20;10:5115. doi: 10.1038/s41598-020-61970-8

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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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Sfrp1^−/− mice have a slightly reduced visual function. (a–d) The graphs and traces of representative recordings show the a- and b-wave amplitude (µV; defined in Fig. S2) of the scotopic ERG (rods, a–d) and the b-wave amplitude of photopic ERG (cones, e,f) from 4 months-old wt and Sfrp1^−/− animals to flash light stimuli of increasing brightness (cd/m²). (e) The graph shows the amplitude response (µV) to flicker stimuli of increasing frequencies (Hz). No significant changes were detected (Mann-Whitney U test) but mutant mice show a reduced response.