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Figure 2
Binding sites of calcium (a) and sodium (b) ions in EF-EG2 structure. The green and purple contours show the FoFc (7.0σ) map calculated without calcium and sodium ions, respectively. Each binding site is composed of eight and six oxygen atoms chelating to a calcium and sodium ion with distances of 2.3–2.5 and 2.3–2.7 Å (represented by black dashed lines), respectively.

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