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(a) NMR structure of PS1 (PDB-ID 5tgy). (b) X-ray structure of 4DH2 (PDB-ID 5wlm) and close-view of the tetranuclear zinc cluster (histidines have been hidden for clarity). (c) Rocker tetrameric model (PDB-ID 2muz, 4p6j), depicted in a membrane (gray rectangle).
