2I0Q:
reference: Structural reorganization and the cooperative binding of single-stranded telomere DNA in Sterkiella nova., Buczek P, Horvath MP, J Biol Chem. 2006 Dec 29;281(52):40124-34. Epub 2006 Nov 2. PMID: 17082188

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