3A9X:
reference: Reaction mechanism and molecular basis for selenium/sulfur discrimination of selenocysteine lyase., Omi R, Kurokawa S, Mihara H, Hayashi H, Goto M, Miyahara I, Kurihara T, Hirotsu K, Esaki N, J Biol Chem. 2010 Feb 17. PMID: 20164179

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