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Infarct size measurement. Histogram showing the infarct size (IS) as percent of area at risk (AAR) in Controls (Con, n = 8), morphine preconditioning (MPC, n = 8), ischemic preconditioning (IPC, n = 8), morphine preconditioning with paxilline (MPC + Pax, n = 8), ischemic preconditioning with paxilline (IPC + Pax, n = 8), and paxilline alone (Pax, n = 8). Data are mean ± SD; * P < 0.05 vs Con; # P < 0.05 vs IPC; § P < 0.05 vs MPC
