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. 2021 Feb 4;9:636737. doi: 10.3389/fcell.2021.636737

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Copyright © 2021 Barnes, Malhotra and Calvert.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Turnover of photoreceptor OSs. Stack of discs shed from a frog (Rana pipiens) rod OS, phagocytosed by a retinal pigment epithelial cell. ROS, rod OS; P, phagosome. Scale bar, 1 μm. Reproduced from Hollyfield et al. (1977).