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Oxygenic photosynthesis evolved billions of years ago, becoming Earth's main source of biologically available carbon and atmospheric oxygen. Since then, phototrophic organisms have diversified from prokaryotic cyanobacteria into several distinct clades of eukaryotic algae and plants through endosymbiosis events. This diversity can be seen in the thylakoid membranes, complex networks of lipids, proteins, and pigments that perform the light-dependent reactions of photosynthesis. In this review, we highlight the structural diversity of thylakoids, following the evolutionary history of phototrophic species. We begin with a molecular inventory of different thylakoid components and then illustrate how these building blocks are integrated to form membrane networks with diverse architectures. We conclude with an outlook on understanding how thylakoids remodel their architecture and molecular organization during dynamic processes such as biogenesis, repair, and environmental adaptation.
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