3SS9:
reference: Crystal structure of D-serine dehydratase from Escherichia coli., Urusova DV, Isupov MN, Antonyuk S, Kachalova GS, Oblomova G, Vagin AA, Lebedev AA, Bourenko GP, Dauter Z, Bartunik HD, Lamzin VS, Melik-Adamyan WR, Mueller TD, Schnackerz KD, Biochim Biophys Acta. 2011 Nov 27. PMID: 22197591

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