Figure 7.

The extracellular view of possible orientations of mC residues in S5s. mC2o10 (A) and mC4o10 (C) can extend their ammonium groups toward the pore. (B) mC3o10 is stabilized inside the repeat interface by cation–π interaction with F3i18 and Y3o14. The red cross indicates the pore axis.

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