1KHK:
reference: Artificial evolution of an enzyme active site: structural studies of three highly active mutants of Escherichia coli alkaline phosphatase., Le Du MH, Lamoure C, Muller BH, Bulgakov OV, Lajeunesse E, Menez A, Boulain JC, J Mol Biol. 2002 Mar 1;316(4):941-53. PMID: 11884134

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