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Central region of the pore formed by residues 13–21. Space-filled representations of side chains that line the pore are colored by element. (A) Side view showing only four subunits on each side of the pore. (B) Top view through the pore of all subunits. Note that V18 and F20 side chains are buried behind H14 side chains, and that H13 side chains are relatively exposed near the axis of the pore.
