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Influence of retinoic acid (ATRA, 5 μM) on the proliferation of parental and RARα transfected cells. Cells were seeded into 24-well plates (1 × 104 cell per well), ATRA was added at seeding and the cell number was counted at days 1, 3, 5 and 8 after seeding. This figure is representative of 3 separate experiments.
