1XAV:
reference: Solution structure of the biologically relevant G-Quadruplex element in the human c-MYC promoter. Implications for G-quadruplex stabilization., Ambrus A, Chen D, Dai J, Jones RA, Yang D, Biochemistry 2005 Feb 15;44(6):2048-58. PMID: 15697230

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