1GUC:
reference: Investigation of the structural basis for thermodynamic stabilities of tandem GU mismatches: solution structure of (rGAGGUCUC)2 by two-dimensional NMR and simulated annealing., McDowell JA, Turner DH, Biochemistry 1996 Nov 12;35(45):14077-89. PMID: 8916893

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