| 2CLT: reference: Crystal structure of an active form of human MMP-1., Iyer S, Visse R, Nagase H, Acharya KR, J Mol Biol. 2006 Sep 8;362(1):78-88. Epub 2006 Aug 4. PMID: 16890240 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).