3NH4:
reference: Structures of aminoacylase 3 in complex with acetylated substrates., Hsieh JM, Tsirulnikov K, Sawaya MR, Magilnick N, Abuladze N, Kurtz I, Abramson J, Pushkin A, Proc Natl Acad Sci U S A. 2010 Oct 4. PMID: 20921362

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