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A) Cell cycle activity, measured by Ki-67, decreased in both T3-infused and TX fetuses. A1) Image at ×400. B) Mitotic activity of myocytes, measured by phospho-histone 3 expression, was decreased in both T3-infused and TX fetuses. B1) Image at ×400. Arrows indicate positively labeled cardiomyocytes. Data are means ± se; n = 8/group. *P < 0.05; **P < 0.01 vs. control.
