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. 2023 Sep 29;118(1):39. doi: 10.1007/s00395-023-01011-3

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© The Author(s) 2023

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 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/.

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Fig. 2 — Transmission electron microscopy micrographs of enlarged mitochondria in rat papillary muscle derived from the left ventricular myocardium. A Longitudinally orientated muscle section shows elongated subsarcolemmal mitochondria and B transverse section showing concentric arrangement of cristae. End magnifications, × 43,000 (A); × 53,000 (B). (Figs. 1 and 24: The Journal of Biophysical and Biochemical Cytology by Rockefeller Institute Press [65]. Reproduced and lettering modified with permission of Rockefeller Institute Press in the format Journal/Magazine via Copyright Clearance Center)