| 6BBL: reference: Structural characterization of the nitrogenase molybdenum-iron protein with the substrate acetylene trapped near the active site., Keable SM, Vertemara J, Zadvornyy OA, Eilers BJ, Danyal K, Rasmussen AJ, De Gioia L, Zampella G, Seefeldt LC, Peters JW, J Inorg Biochem. 2017 Dec 13;180:129-134. doi: 10.1016/j.jinorgbio.2017.12.008. PMID: 29275221 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).