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. 2018 Oct 31;9:4540. doi: 10.1038/s41467-018-06957-w

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© The Author(s) 2018

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Fig. 2 — Anomalous difference map. The anomalous difference Fourier map contoured at 8σ is shown as a magenta mesh for subunit A. Strong anomalous difference peaks corresponding to the K⁺ ions (cyan spheres) are present within the selectivity filter of the ion channel. For clarity only two of the four subunits that make up the ion channel are shown