1U0X:
reference: Structural dynamics controls nitric oxide affinity in nitrophorin 4., Nienhaus K, Maes EM, Weichsel A, Montfort WR, Nienhaus GU, J Biol Chem 2004 Sep 17;279(38):39401-7. Epub 2004 Jul 16. PMID: 15258143

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