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(a) Cage structure of three domain-swapped Cytcb562 dimers (PDB code 5AWI), and a close-up view of the Zn2+ and SO42− ions in the internal cavity. Reprinted with permission from Ref. [59], Copyright 2016 The Royal Society of Chemistry; (b) Crystal structure of 4DH1 (PDB code 5WLL), and a close-up view of the designed tetranuclear zinc cluster. Reprinted with permission from Ref. [63], Copyright 2018 American Chemical Society.
