4GH8:
reference: Functional significance of evolving protein sequence in dihydrofolate reductase from bacteria to humans., Liu CT, Hanoian P, French JB, Pringle TH, Hammes-Schiffer S, Benkovic SJ, Proc Natl Acad Sci U S A. 2013 Jun 18;110(25):10159-64. doi:, 10.1073/pnas.1307130110. Epub 2013 Jun 3. PMID: 23733948

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