5JRG:
reference: Polymorphism of apyrimidinic DNA structures in the nucleosome., Osakabe A, Arimura Y, Matsumoto S, Horikoshi N, Sugasawa K, Kurumizaka H, Sci Rep. 2017 Jan 31;7:41783. doi: 10.1038/srep41783. PMID: 28139742

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