1K5I:
reference: NMR structure of a ribosomal RNA hairpin containing a conserved CUCAA pentaloop., Nagaswamy U, Gao X, Martinis SA, Fox GE, Nucleic Acids Res 2001 Dec 15;29(24):5129-39. PMID: 11812846

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