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(a) Pd(allyl) complexes binding to the threefold channel of apo-Fr, which form a trinuclear Pd-cluster as a result of H114A mutation. Reprinted with permission from Ref. [76], Copyright 2008 American Chemical Society. (b) X-ray crystal structures Au-loaded apo-Frs in the absence and presence of different concentrations of NaBH4, showing the process of formation of an Au-cluster at the threefold channel of apo-Fr [77].
