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A) Immunoblots of cell cycle proteins in cardiomyocytes from T3-infused and TX fetuses compared to controls. B) Cell cycle suppressant p21 was markedly elevated in T3-infused compared to control and TX fetuses. C) Expression of cell cycle promoter cyclin D1 is diminished in T3-infused compared to control and TX fetuses. Data are means ± se; n = 8/group. **P < 0.05 vs. control; ++P < 0.01 vs. T3.
