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Effect of Pol III elements on reporter activities of Pr-1 and Pr-2. Pol III elements were inserted upstream or downstream of Pr-1 or Pr-2, and the reporter activities of each construct were examined by a dual luciferase reporter system in PC-3 (A), 293T (B), and U87MG (C) cells. Data shown are the means ± S.D. of three independent experiments.
