3BLS:
reference: Three-dimensional structure of AmpC beta-lactamase from Escherichia coli bound to a transition-state analogue: possible implications for the oxyanion hypothesis and for inhibitor design., Usher KC, Blaszczak LC, Weston GS, Shoichet BK, Remington SJ, Biochemistry 1998 Nov 17;37(46):16082-92. PMID: 9819201

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