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. 2021 Sep 22;11:18863. doi: 10.1038/s41598-021-98409-7

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© The Author(s) 2021

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In healthy-looking cones different mitochondrial shapes are associated with different parts of the photoreceptor. (A) A montage of several TEM micrographs of the longitudinal section of a healthy-looking cone. The ER is high-lighted in yellow, the Golgi apparatuses in green. (B) A TEM micrograph showing a transverse section through a healthy-looking cone. Mitochondria are densely-packed in the ellipsoid. (C–E) Partial 3D segmentation of 3 representative cones identifying different mitochondrial shapes in different regions of the cone ellipsoid. The smaller panels beneath show cut transverse sections through these constructions. (F) Histogram showing the average lengths of mitochondria from different parts of the cone. (G) Histogram showing the ratio between length and width of mitochondria from different regions of the cone. Mitochondria intimately associated with the plasma membrane of the cone (green) are elongated. Those inner mitochondria that are only partially associated with the plasma membrane (cyan) are shorter and have a more varied width. Mitochondria at the base of the cone are shorter and stubbier (dark blue). Mitochondria fragments in the core of the cone (red) are very small.