1Z88:
reference: Structural and mutational analyses reveal the functional role of active-site Lys-154 and Asp-173 of Salmonella typhimurium AphA protein., Makde RD, Gupta GD, Mahajan SK, Kumar V, Arch Biochem Biophys. 2007 Aug 1;464(1):70-9. Epub 2007 May 30. PMID: 17570338

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