6AE5:
reference: A unique intra-molecular fidelity-modulating mechanism identified in a viral RNA-dependent RNA polymerase., Liu W, Shi X, Gong P, Nucleic Acids Res. 2018 Sep 20. pii: 5103954. doi: 10.1093/nar/gky848. PMID: 30239956

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