2PLP:
reference: Ultrahigh-resolution backbone structure of perdeuterated protein GB1 using residual dipolar couplings from two alignment media., Bouvignies G, Meier S, Grzesiek S, Blackledge M, Angew Chem Int Ed Engl. 2006 Dec 11;45(48):8166-9. PMID: 17120284

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