3QG2:
reference: Trypanosomal Dihydrofolate Reductase Reveals Natural Antifolate Resistance., Vanichtanankul J, Taweechai S, Yuvaniyama J, Vilaivan T, Chitnumsub P, Kamchonwongpaisan S, Yuthavong Y, ACS Chem Biol. 2011 Jun 16. PMID: 21650210

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