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Effect of the transcriptional inhibitor actinomycin D on the observed induction in RF uptake in RF deficiency. β-TC-6 cells were maintained (48 h) in RF-deficient growth medium in the presence and absence of actinomycin D, followed by determination of initial rate of RF (14 nM) uptake. Values are means ± SE of 3 independent experiments. *P < 0.05.
