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Electrostatic potential surface of CsgG nonamer [4UV3 (37)] zoomed at the periplasmic interface with CsgE. It is formed by the extended α2 helix and the flexible loop after α2. The surface is highly positively charged by residues R93, K94, and R97 located at the α2 helix and R110 located at the loop near α2. The small negative patch is a result of E101 at the α2 helix.
