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Popping corks: The protonated urea ions (C black, N/O green) that cork the pores of a polyoxomolybdate capsule (Mo blue, O red) can be reversibly removed allowing the entry of Ca2+ ions (pink) into the capsule. This process resembles the functioning of gated calcium channels in cell membranes.
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Müller et al. (2005) studied this question.
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