1RRA:
reference: The crystal structure of recombinant rat pancreatic RNase A., Gupta V, Muyldermans S, Wyns L, Salunke DM, Proteins 1999 Apr 1;35(1):1-12. PMID: 10090281

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