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A: representative ex vivo murine electrocardiogram (ECG) waveform showing interval measurements. Average fold change of heart rate (B), PR interval (C), QRS duration (D), QT interval (E), and QTc (Bazett correction) (F) after 15 min and 30 min of perfusion with vehicle (n = 10) or fibroblast growth factor 23 (FGF23) (9 ng/mL; n = 13). **P < 0.01 compared with vehicle.
