2C7G:
reference: Role of the His57-Glu214 ionic couple located in the active site of Mycobacterium tuberculosis FprA., Pennati A, Razeto A, de Rosa M, Pandini V, Vanoni MA, Mattevi A, Coda A, Aliverti A, Zanetti G, Biochemistry. 2006 Jul 25;45(29):8712-20. PMID: 16846214

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