| 4ER1: The Active Site Of Aspartic Proteinases reference: The active site of aspartic proteinases., Pearl L, Blundell T, FEBS Lett 1984 Aug 20;174(1):96-101. PMID: 6381096 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).