| 4X1B: reference: "Anion clamp" allows flexible protein to impose coordination geometry on metal ions., Wang M, Lai TP, Wang L, Zhang H, Yang N, Sadler PJ, Sun H, Chem Commun (Camb). 2015 Apr 9. PMID: 25854324 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).