5XZI:
reference: Importance of Scaffold Flexibility/Rigidity in the Design and Directed Evolution of Artificial Metallo-beta-lactamases., Song WJ, Yu J, Tezcan FA, J Am Chem Soc. 2017 Nov 22;139(46):16772-16779. doi: 10.1021/jacs.7b08981. Epub, 2017 Nov 9. PMID: 28992705

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