1RS9:
reference: Structures of the neuronal and endothelial nitric oxide synthase heme domain with D-nitroarginine-containing dipeptide inhibitors bound., Flinspach M, Li H, Jamal J, Yang W, Huang H, Silverman RB, Poulos TL, Biochemistry 2004 May 11;43(18):5181-7. PMID: 15122883

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