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Fig. 7. Characteristics of SCTs observed during superfusion with isoproterenol. (A) Average frequency of SCTs (mean ± s.e.m.; n=12 cells) of SCTs during continuous superfusion of isolated ventricular myocytes with isoproterenol (100 nM). (B) Time of occurrence of the SCTs relative to the previous field-stimulation-evoked Ca2+ signal. (C,D) Number of spontaneous Ca2+ sparks recorded using confocal imaging of electrically (C) paced or (D) unpaced cells.