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Figure 4.
(a) F[Ba soak] – F[K] difference map (blue mesh) contoured
at 10  showing
the two Ba^2+ binding sites. (b) 2F[o] – F[c] ion omit maps of
a Ba^2+-soaked crystal contoured at 1.5 .
The electron density at the external entrance and site 3 was
modeled as Ba^2+ (orange spheres), and water molecules are
modeled as red spheres. (c) Ba^2+ (left) and Ca^2+ (right)
blocking of ^86Rb influx in liposomes loaded with NaCl.
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