Symmetric Allosteric Mechanism of Hexameric Escherichia coli Arginine Repressor Exploits Competition between L-Arginine Ligands and Resident Arginine Residues. - Rebecca Strawn; Milan Melichercik; Michael Green; Thomas Stockner; Jannette Carey; Rüdiger Ettrich (PLoS Comput. Biol., 2010)