4D9G:
reference: Crystal Structure of Escherichia coli Diaminopropionate Ammonia-lyase Reveals Mechanism of Enzyme Activation and Catalysis., Bisht S, Rajaram V, Bharath SR, Kalyani JN, Khan F, Rao AN, Savithri HS, Murthy MR, J Biol Chem. 2012 Jun 8;287(24):20369-81. Epub 2012 Apr 13. PMID: 22505717

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