1MMI:
reference: Flexibility revealed by the 1.85 A crystal structure of the beta sliding-clamp subunit of Escherichia coli DNA polymerase III., Oakley AJ, Prosselkov P, Wijffels G, Beck JL, Wilce MC, Dixon NE, Acta Crystallogr D Biol Crystallogr 2003 Jul;59(Pt 7):1192-9. PMID: 12832762

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