Time-course analysis of the effect of growth factor readdition on PKC isoform expression in 32D Epo1.1 cells cultured in Epo (A) or IL-3 (B). Semiquantitative densitometric analysis on Western blot experiments shown in the legend of Fig 6 is reported. The values represent the means ± SD of five separate experiments. (▪) ; (□) βI; (•) δ; (○) ɛ; (▴) η; (▵) ζ.