| 1AOQ: reference: Haem-ligand switching during catalysis in crystals of a nitrogen-cycle enzyme., Williams PA, Fulop V, Garman EF, Saunders NF, Ferguson SJ, Hajdu J, Nature 1997 Sep 25;389(6649):406-12. PMID: 9311786 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).