The inner segment of photoreceptors in the retina is packed with long, thin mitochondria that contain curved cristae. This image by Toichiro Kuwabara is of a photoreceptor from human retina, and appears as Figure 257 from Chapter 7 (Mitochondria) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. A PDF copy of the accompanying chapter is available on the ASCB’s BioEDUCATE website.
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