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Incidence of spontaneous activity emergent at 0.5-Hz stimulation. a The percentage of cells that exhibited spontaneous activity (i.e. non-stimulated) when subjected to a low-frequency stimulation protocol (0.5-Hz stimulation). b Representative traces for young adult female AngII-TG and aged adult female AngII-TG cardiomyocytes stimulated at 0.5 Hz. Arrows depict stimulus
