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Response of cardiac myocytes to increasing concentrations of the β-adrenergic agonist, isoproterenol (ISO), alone and with incubation with NAC (10−3 M) on %PS (A), positive inotropy (+dl/dt; B), and negative inotropy (−dl/dt; C). Values are means ± SE; n = 15. Con vs. Stress, *P < 0.01; Stress vs. Stress + NAC, #P < 0.01.
