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. 2015 Aug 14;10(8):e0133000. doi: 10.1371/journal.pone.0133000

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© 2015 Mahdavi, Kuyucak

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 6 — One Na⁺ ion is in the SF at z = 9.7 Å, and two Na⁺ ions are in the vestibule at z = 21.6 and 23.5 Å. The two ions in the vestibule are in off-axis positions and separated by about 11 Å. The domains DI and DIII (left) and DII and DIV (right) are shown separately for clarity.