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Using 5 μM TTNPB, a stable RAR agonist (A) and 5 μM methoprene acid, a RXR agonist (B) in the presence (+) or absence (-) of RA and BMP-4 revealed the involvement of both RA receptor subtypes in RA and RA/BMP-4 mediated apoptosis induction in WERI-Rb1 cells. Values are means from two to three independent experiments ± SEM. **P < 0.01; ***P < 0.001 statistical differences calculated by one way Annova and Newman-Keuls Post test.
