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Figure 2.
Fig. 2. Section of the c ring showing the interface between the
N-terminal and two C-terminal helices with those side chains
discussed in the text. This three-helix bundle represents a
functional unit responsible for Na^+ binding and allowing access
of the ion to the binding site. The view is normal to the
external surface of the c ring with the ring axis approximately
vertical. The color coding of the subunits is the same as in
Fig. 1A.
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