Fig. 3. The effect of H2O2and isoflurane on caspase activity ( A ) and TUNEL-positive staining ( B ) in mouse HL-1 cells ( solid bars ) and neonatal rat ventricular myocytes ( hatched bars ). Control conditions (CON), after exposure to hydrogen peroxide (H2O2), and after pretreatment with isoflurane in the presence (ISO + H2O2) or absence (ISO) of H2O2. * Significantly ( P < 0.05) different from CON; † significantly ( P < 0.05) different from H2O2, n = 10.