. "Catalysis of the reaction: 5,6,7,8-tetrahydrofolate + NADP+ = 7,8-dihydrofolate + NADPH + H+." . . "DHFR" . "dihydrofolate reductase activity" . "5,6,7,8-tetrahydrofolate:NADP+ oxidoreductase activity" . "7,8-dihydrofolate reductase activity" . "dihydrofolate reductase:thymidylate synthase activity" . "dihydrofolate reduction" . "dihydrofolic acid reductase activity" . "dihydrofolic reductase activity" . "folic acid reductase activity" . "folic reductase activity" . "NADPH-dihydrofolate reductase activity" . "pteridine reductase:dihydrofolate reductase activity" . "tetrahydrofolate dehydrogenase activity" . "thymidylate synthetase-dihydrofolate reductase activity" . . .