![](http://monod.biomath.nyu.edu/sites/default/files/sites/default/files/biomath_art/yanglj-art7.gif)
Dynamic pathway of a Na+ counterion (yellow ball) diffusing into the active site (pink stick) of DNA polymerase β/DNA complex from 20 A away in solution.
Dynamic pathway of a Na+ counterion (yellow ball) diffusing into the active site (pink stick) of DNA polymerase β/DNA complex from 20 A away in solution.