Effect of SA incubation with eosinophils for 19 hours on percent apoptotic nuclei compared with medium control. The data were determined by PI uptake (modified Nicoletti’s protocol) and are given as mean ± SEM values of 8 separate experiments with eosinophils of different subjects. Fifty and 100 μmol/L SA significantly enhanced eosinophil apoptosis, whereas at higher concentrations (200 to 500 μmol/L), this apoptosis inducing effect was reversed. **P < .01 versus control medium.