5ZL6:
reference: The first identification and characterization of a histidine-specific amino acid racemase, histidine racemase from a lactic acid bacterium, Leuconostoc mesenteroides subsp. sake NBRC 102480., Adachi M, Shimizu R, Kato S, Oikawa T, Amino Acids. 2018 Oct 30. pii: 10.1007/s00726-018-2671-y. doi:, 10.1007/s00726-018-2671-y. PMID: 30377839

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