3LOA:
reference: A model for the study of ligand binding to the ribosomal RNA helix h44., Dibrov SM, Parsons J, Hermann T, Nucleic Acids Res. 2010 Jul;38(13):4458-65. Epub 2010 Mar 9. PMID: 20215440

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