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. 2018 Jul 9;9(7):753. doi: 10.1038/s41419-018-0794-4

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© The Author(s) 2018

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. 6 — Representative TEM photomicrographs of ARPE-19 cells exposed to Cys₂ starvation milieu, 1000 µM BSO, and 10 µM erastin for 24 and 48 h. Autophagic vacuoles are indicated by red arrows. The lower panel of each treatment shows the high magnification image of the upper panel. Scale bars are displayed in each image