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![[Figure 2]](nw5095fig2mag.jpg)
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Figure 2
The two proposed mechanisms by which potassium ions permeate through potassium ion channels. (a) In the soft knock-on mechanism, potassium ions (orange spheres) are separated by water molecules (red spheres) in the SF. (b) In the hard knock-on mechanism, potassium ions (orange spheres) occupy each of the four binding sites within the SF. |
![[Figure 2]](nw5095fig2.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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