3TA7:
reference: Structural insights to the metal specificity of an archaeal member of the LigD 3'-phosphoesterase DNA repair enzyme family., Das U, Smith P, Shuman S, Nucleic Acids Res. 2012 Jan 1;40(2):828-36. Epub 2011 Sep 28. PMID: 21965539

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