5MX2:
reference: Structural insights into the light-driven auto-assembly process of the water-oxidizing Mn4CaO5-cluster in photosystem II., Zhang M, Bommer M, Chatterjee R, Hussein R, Yano J, Dau H, Kern J, Dobbek H, Zouni A, Elife. 2017 Jul 18;6. pii: e26933. doi: 10.7554/eLife.26933. PMID: 28718766

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