3O20:
reference: Nitrate as a probe of cytochrome c surface: crystallographic identification of crucial "hot spots" for protein-protein recognition., De March M, Demitri N, De Zorzi R, Casini A, Gabbiani C, Guerri A, Messori L, Geremia S, J Inorg Biochem. 2014 Jun;135:58-67. doi: 10.1016/j.jinorgbio.2014.02.015. Epub, 2014 Mar 11. PMID: 24662464

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