1GQZ:
reference: Refinement of Haemophilus influenzae diaminopimelic acid epimerase (DapF) at 1.75 A resolution suggests a mechanism for stereocontrol during catalysis., Lloyd AJ, Huyton T, Turkenburg J, Roper DI, Acta Crystallogr D Biol Crystallogr 2004 Feb;60(Pt 2):397-400. Epub 2004, Jan 23. PMID: 14747737

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