Fig. 3From: Variations in periplasmic loop interactions determine the pH-dependent activity of the hexameric urea transporter UreI from Helicobacter pylori: a molecular dynamics studySchematic representation of salt bridges. a Possible interaction between intra-loop residues and inter-chain residues at pH 2.0. b Interactions between inter-loop residues and inter-chain residues at pH 6.0. Red dashed lines represent which residues are interacting. The figures were rendered with the visualization software PyMolBack to article page