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Human dihydrofolate reductase (DHFR) is a critical target in cancer chemotherapy. Previous studies showed that an 82-nt RNA fragment within the DHFR mRNA protein-coding region functions as a DHFR cis-acting response element. In this study, we further investigated the key elements contained within this sequence that are required for the DHFR mRNA–DHFR protein interaction. Using enzymatic foot-printing...