| 3DYB: reference: High-resolution structure of proteinase K cocrystallized with digalacturonic acid., Larson SB, Day JS, Nguyen C, Cudney R, McPherson A, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2009 Mar 1;65(Pt, 3):192-8. Epub 2009 Feb 12. PMID: 19255463 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).