2MNR:
reference: Mechanism of the reaction catalyzed by mandelate racemase. 2. Crystal structure of mandelate racemase at 2.5-A resolution: identification of the active site and possible catalytic residues., Neidhart DJ, Howell PL, Petsko GA, Powers VM, Li RS, Kenyon GL, Gerlt JA, Biochemistry 1991 Sep 24;30(38):9264-73. PMID: 1892834

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