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Dose-response curve of NAC and its effect on cardiac myocyte recovery after exposure to caffeine (10 mM). Results are measured as baseline, caffeine exposure, and 30 min after caffeine exposure with perfusion in buffer alone or NAC. Different myocytes were used for each concentration of NAC. A: change in Ca2+ concentration. B: Ca2+ departure velocity. C: Ca2+ return velocity. Values are means ± SE; n = 15. Con vs. Stress, P < 0.01.
