3WUY:
reference: Structural insights into enzymatic activity and substrate specificity determination by a single amino acid in nitrilase from Syechocystis sp. PCC6803., Zhang L, Yin B, Wang C, Jiang S, Wang H, Yuan YA, Wei D, J Struct Biol. 2014 Oct 17;188(2):93-101. doi: 10.1016/j.jsb.2014.10.003. PMID: 25450592

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