CASP3 and infection: In cells assayed at 24 hours post-infection (lanes C and D), caspase 3/7 activity in the absence of staurosporine was slightly suppressed compared to uninfected cells, but most notably the increase in activity induced by staurosporine was suppressed to 0.59 ± 0.08 compared to staurosporine-treated, uninfected cells (1.00 ± 0.01).