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. Author manuscript; available in PMC: 2022 Jul 1.
Published in final edited form as: Nat Struct Mol Biol. 2021 Dec 30;29(1):40–46. doi: 10.1038/s41594-021-00699-y

Fig. 5 |. The selectivity filter.

Fig. 5 |

a, The SF viewed from the extracellular side (left) and parallel to the membrane (right). Only the side-chains of the four charged amino acids are shown. b, Densities of the side chains of the four charged residues, viewed from the extracellular side. Densities are shown as blue mesh and are contoured to 3σ. c, Interaction network of R403 of B3. Hydrogen bonds are shown as yellow dash lines.