1DF1:
reference: N-terminal domain swapping and metal ion binding in nitric oxide synthase dimerization., Crane BR, Rosenfeld RJ, Arvai AS, Ghosh DK, Ghosh S, Tainer JA, Stuehr DJ, Getzoff ED, EMBO J 1999 Nov 15;18(22):6271-81. PMID: 10562539

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