4NDP:
reference: Structural diversity of polyoxomolybdate clusters along the three-fold axis of the molybdenum storage protein., Poppe J, Warkentin E, Demmer U, Kowalewski B, Dierks T, Schneider K, Ermler U, J Inorg Biochem. 2014 Sep;138:122-8. doi: 10.1016/j.jinorgbio.2014.05.009. Epub, 2014 May 28. PMID: 24945101

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