1XS1:
reference: Structures of dCTP deaminase from Escherichia coli with bound substrate and product. Reaction mechanism and determinants of mono- and bifunctionality for a family of enzymes., Johansson E, Fano M, Bynck JH, Neuhard J, Larsen S, Sigurskjold BW, Christensen U, Willemoes M, J Biol Chem 2004 Nov 10;. PMID: 15539408

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