3ZVI:
reference: Engineering methylaspartate ammonia lyase for the asymmetric synthesis of unnatural amino acids., Raj H, Szymanski W, de Villiers J, Rozeboom HJ, Veetil VP, Reis CR, de Villiers M, Dekker FJ, de Wildeman S, Quax WJ, Thunnissen AM, Feringa BL, Janssen DB, Poelarends GJ, Nat Chem. 2012 Apr 29;4(6):478-84. doi: 10.1038/nchem.1338. PMID: 22614383

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