4PRS:
reference: A loose domain swapping organization confers a remarkable stability to the dimeric structure of the arginine binding protein from Thermotoga maritima., Ruggiero A, Dattelbaum JD, Staiano M, Berisio R, D'Auria S, Vitagliano L, PLoS One. 2014 May 15;9(5):e96560. doi: 10.1371/journal.pone.0096560. eCollection, 2014. PMID: 24832102

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).