1ML7:
reference: Axial ligand complexes of the Rhodnius nitrophorins: reduction potentials, binding constants, EPR spectra, and structures of the 4-iodopyrazole and imidazole complexes of NP4., Berry RE, Ding XD, Shokhireva TKh, Weichsel A, Montfort WR, Walker FA, J Biol Inorg Chem 2004 Mar;9(2):135-44. Epub 2003 Dec 13. PMID: 14673714

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