Rapid inhibition of VP-16–induced apoptosis by H₂O₂.

JLP 119 cells were treated for 4 hours with 8.5 μmol/L VP-16 in the presence or absence of 75 μmol/L H₂O₂, added 30 minutes after the VP-16. Cell death was assayed by fluorescence microscopy, as described in “Materials and methods.”