1P6N:
reference: Structural basis for dipeptide amide isoform-selective inhibition of neuronal nitric oxide synthase., Flinspach ML, Li H, Jamal J, Yang W, Huang H, Hah JM, Gomez-Vidal JA, Litzinger EA, Silverman RB, Poulos TL, Nat Struct Mol Biol 2004 Jan;11(1):54-9. Epub 2003 Dec 29. PMID: 14718923

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