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. 2020 Mar 14;18:45. doi: 10.1186/s12964-020-00548-3

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 6 — Retina development in cox17^−/− mutant treated with copper. A TEM analysis of retinal cells in copper stressed cox17^−/− mutant embryos at 96 hpf. A1-A3, sagittal slides of retina, red color indicating mitochondria and green color indicating ER. B Quantitative PCR of ROS related genes (B1; cox4i2, hmox2, lox, and nrf2), UPR related genes (B2; ire1a, perk, and atf6), and retinal genes (B3; opn1wl1, opn1sw1, opn1sw2 and rhodopsin) in cox17^−/− mutants. C WISH assays of ER stress marker bip and chop in cox17^−/− mutants. D WISH assays of retinal marker genes (opn1wl1 and opn1sw1) in cox17^−/− mutants. C1-C8, lateral view, anterior to the left, D1-D8, dorsal view, anterior to the up, and Scale bar: A1-A3, 1 μm; C1-C8 and D1-D8, 100 μm. **, P < 0.01; *, P < 0.05