1MMS:
reference: A detailed view of a ribosomal active site: the structure of the L11-RNA complex., Wimberly BT, Guymon R, McCutcheon JP, White SW, Ramakrishnan V, Cell 1999 May 14;97(4):491-502. PMID: 10338213

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