Mean percentage neuronal cell death . A. Data are shown for cells exposed to normal conditions (NC) or glucose deprivation with vehicle for 24 h (GD). Other cells exposed to GD were treated with Compound 21 at 1x10-8 M (C21-8), 1x10-7 M (C21-7), 1x10-6 M (C21-6) (n = 6) (NS P > 0.05 vs. vehicle). B. Cells were treated with Compound 21 in the presence of 1x10-6 M PD123319 (PD-6) (n = 6) (NS P > 0.05 vs. vehicle).