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Intracellular Ca2+ concentration ([Ca2+]i) transients and cell shortening in induced and noninduced myocytes. A and B: representative traces of [Ca2+]i transients (A) and contraction (B) in noninduced (left) and induced (right) myocytes paced at 2 Hz, 1.8 mM extracellular Ca2+ concentration ([Ca2+]o), and 37°C. Iso, where indicated, was at 1 μM. Composite results are shown in Table 3.
