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. 2001 Mar;10(3):613–621. doi: 10.1110/gad.34501

Fig. 5.

Fig. 5.

The electrostatic potential surfaces of (a) the oxidized form and (b) the reduced form (in open water gate state). Upon reduction and consequent opening of the gate, Cys 9 Sγ exposes its electronegative potential surface to the solvent, and this extra electronegative potential hole could attract the string of water molecules.