1JES:
reference: Structure of a copper-mediated base pair in DNA., Atwell S, Meggers E, Spraggon G, Schultz PG, J Am Chem Soc 2001 Dec 12;123(49):12364-7. PMID: 11734038

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