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(a) Overall structure of photosystem II. Reprinted with permission from ref (151). Copyright 2004 American Association for the Advancement of Science. (b) Molecular structure of the Mn4CaO5 OEC. Adapted with permission from ref (136). Copyright Springer Nature 2011. (c) 45°-Rotated view of Co-OEC. Adapted with permission from ref (142). Copyright 2021 American Chemical Society. (d) Cu4O4 cubane. Adapted with permission from ref (145). Copyright 2018 Wiley-VCH.
