1LNI:
reference: Atomic resolution data reveal flexibility in the structure of RNase Sa., Sevcik J, Lamzin VS, Dauter Z, Wilson KS, Acta Crystallogr D Biol Crystallogr 2002 Aug;58(Pt 8):1307-13. PMID: 12136142

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