4ECA:
reference: A covalently bound catalytic intermediate in Escherichia coli asparaginase: crystal structure of a Thr-89-Val mutant., Palm GJ, Lubkowski J, Derst C, Schleper S, Rohm KH, Wlodawer A, FEBS Lett 1996 Jul 22;390(2):211-6. PMID: 8706862

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