1RBN:
reference: Structure of ribonuclease A derivative II at 2.1-A resolution., Boque L, Gracia Coll M, Vilanova M, Cuchillo CM, Fita I, J Biol Chem 1994 Aug 5;269(31):19707-12. PMID: 8051049

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