4V7P:
reference: Recognition of the amber UAG stop codon by release factor RF1., Korostelev A, Zhu J, Asahara H, Noller HF, EMBO J. 2010 Aug 4;29(15):2577-85. Epub 2010 Jun 29. PMID: 20588254

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