2ZPU:
reference: Serine racemase with catalytically active lysinoalanyl residue., Yamauchi T, Goto M, Wu HY, Uo T, Yoshimura T, Mihara H, Kurihara T, Miyahara I, Hirotsu K, Esaki N, J Biochem. 2009 Apr;145(4):421-4. Epub 2009 Jan 20. PMID: 19155267

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