1SNC:
reference: The crystal structure of the ternary complex of staphylococcal nuclease, Ca2+, and the inhibitor pdTp, refined at 1.65 A., Loll PJ, Lattman EE, Proteins 1989;5(3):183-201. PMID: 2780539

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