Figure 3

Scavenging H₂O₂ in mitochondria suppresses T3-stimulated but not developmental cardiomyocyte expansion in neonates. Cardiomyocyte numbers in vehicle or T3-treated mice showing the effect of genetically targeted H₂O₂-ROS scavenger, catalase, to the mitochondria (m-CAT-Tg). Error bars indicate SEM. ***P < 0.001.