1MPL:
reference: The crystal structure of phosphonate-inhibited D-Ala-D-Ala peptidase reveals an analogue of a tetrahedral transition state., Silvaggi NR, Anderson JW, Brinsmade SR, Pratt RF, Kelly JA, Biochemistry 2003 Feb 11;42(5):1199-208. PMID: 12564922

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