Fig. 7. Assay for caspase 3 enzymatic activity in soybean cell-suspension culture. White bar, untreated cells; grey bar, cells treated for 24 hours with 50 µM CPA; black bar, cells treated for 24 hours with 50 µM CPA in the presence of the caspase 3 inhibitor Ac-DEVD-CHO (20 µM). Caspase 3-like activity in untreated cells was taken as 100%. Data are means±s.d. of three independent experiments. Statistically significant at **P<0.005.