Fig. 4.

The effect of selective calcium channel antagonists on stimulation-induced expression of TH mRNA.A, TH mRNA expression in E16.5 PG cultures stimulated at 5 Hz or with 40 mm KCl for 24 hr in the presence or absence of 1 μm ω-conotoxin (ω-Ctx) or 2 μm nimodipine (Nim). Scale bar, 50 μm.B, Each bar represents the percentage of total neurons exhibiting TH mRNA by in situhybridization. Data are presented as the mean ± SEM. Comparisons among groups were made using ANOVA followed by Duncan's multiple range test; *p ≤ 0.05; ***p ≤ 0.001. Ctrl, Control.