4K6N:
reference: Structure and catalytic mechanism of yeast 4-amino-4-deoxychorismate lyase., Dai YN, Chi CB, Zhou K, Cheng W, Jiang YL, Ren YM, Ruan K, Chen Y, Zhou CZ, J Biol Chem. 2013 Aug 9;288(32):22985-92. doi: 10.1074/jbc.M113.480335. Epub 2013, Jul 1. PMID: 23818518

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