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Recovery of cardiac myocytes after exposure to caffeine (10 mM). Results are measured as baseline, caffeine exposure, and time since caffeine exposure. A: change in Ca2+ concentration (Con vs. Stress, P < 0.05). B: Ca2+ departure velocity (Con vs. Stress, P < 0.01). C: Ca2+ return velocity (Con vs. Stress, P < 0.01). Values are means ± SE; n = 15.
