| 1C9V: reference: Contribution of the active site histidine residues of ribonuclease A to nucleic acid binding., Park C, Schultz LW, Raines RT, Biochemistry 2001 Apr 24;40(16):4949-56. PMID: 11305910 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).