Stereoview of the proximal pocket of Cgb. The distances between residues are as follows: TyrG5–HisF8, 3.20 Å; GluH23–HisF8, 2.70 Å; GluH23–TyrG5, 2.62 Å; TyrH12–TyrG5, 2.75 Å; TyrH27–ValFG4, 2.64 Å; TrpH8–CysA11, 3.39 Å. Hydrogen bonding interactions inferred from the structure are indicated by dotted lines.