1IDZ:
reference: A small engineered protein lacks structural uniqueness by increasing the side-chain conformational entropy., Furukawa K, Oda M, Nakamura H, Proc Natl Acad Sci U S A 1996 Nov 26;93(24):13583-8. PMID: 8942977

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