4XT6:
reference: Structural Insights into Mycobacterium tuberculosis Rv2671 Protein as a Dihydrofolate Reductase Functional Analogue Contributing to para-Aminosalicylic Acid Resistance., Cheng YS, Sacchettini JC, Biochemistry. 2016 Feb 23;55(7):1107-19. doi: 10.1021/acs.biochem.5b00993. Epub, 2016 Feb 5. PMID: 26848874

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