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Structural interactions of N-terminal pore gates with ion entry and exit channel residues in ferritin protein cages. A and B, M-R72D ferritin. A hydrated Mg2+ is bound by Asp-72 and Asp-122, and the alignment of the channel ions is changed compared with the wild-type structure. C and D, wild-type frog M ferritin binds Mg2+ in the crystals at Thr-118 and in line in the channel.
