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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Electron micrograph of a normal adult rat. Note sarcomeres attached to intercalated disc (ICD) and sarcolemma at Z-band (arrow). Sarcoplasmic reticulum at Z-bands adjacent to mitochondria (arrowheads). Lipid (white arrow) Bar = 2 µm.