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Figure 1
The KcsA amino acid residues that form the selectivity filter, Thr75 to Gly79, and four potassium ions are shown in cyan, while residues Thr63 to Gly67, which form the NaK2K selectivity filter, and four potassium ions are shown in orange. The main-chain RMSD for these residues is only 0.12 Å, indicating that the selectivity filters are identical.

IUCrJ
Volume 7| Part 5| September 2020| Pages 835-843
ISSN: 2052-2525
https://doi.org/10.1107/S2052252520008271