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Effective pore size and radius of capture for K+ ions in K channels

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Figure 1.  The effective opening radius in two K-channel structures. Shown are ~5 Å slabs of the molecular  surface of the large conductance bacterial channel MthK (PDB: 4HYO) and the chimeric Kv1.2/2.1 voltage gated  K-channel (PDB: 2R9R)
Table 1.   Effective pore radii (r E ) for several K +  channel crystals. Surface calculation algorithms were used to  define the cast envelope left by a spherical probe of varying radius 22–24

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