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Fig. 4. Oscillation of intracellular Ca2+ concentration ([Ca2+]i) in a region of the atrial myocardium. The [Ca2+]i was determined by measuring the brightness of all pixels (N=1200) in the region, and the mean brightness ± S.E.M. was obtained. Error bars were all smaller than the size of the symbol. EI-14 (10-7moll-1) was applied at time zero.





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