1GN7:
reference: Solution structure of an intramolecular DNA triplex containing an N7-glycosylated guanine which mimics a protonated cytosine., Koshlap KM, Schultze P, Brunar H, Dervan PB, Feigon J, Biochemistry 1997 Mar 4;36(9):2659-68. PMID: 9054573

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