Time-course analysis of the effect of growth factor readdition on PKC isoform expression in 32D (A), 32D GM1 (B), 32D G (C), and 32D Epo1 (D) cell lines. Semiquantitative densitometric analysis on Western blot experiments shown in the legend of Fig 3 is reported. The values represent the means ± SD of five separate experiments. (▪) ; (□) βI; (•) δ; (○) ɛ; (▴) η; (▵) ζ.