1MF5:
reference: Crystal structure of the complementary quadruplex formed by d(GCATGCT) at atomic resolution., Thorpe JH, Teixeira SC, Gale BC, Cardin CJ, Nucleic Acids Res 2003 Feb 1;31(3):844-9. PMID: 12560479

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