Fig. 1.

Effect of forskolin treatment on Na⁺ uptake. Treatment with 0.1–10 μM forskolin increased Na⁺ uptake in zebrafish larvae in a dose-dependent manner (A; n = 6–10; one-way ANOVA). Treatment with 8-bromo cAMP also increased the uptake of Na⁺ significantly (B; n = 5 or 6; Student's t-test). ^a,b,cDifferent letters denote significant differences among the treatment groups. *Significant difference between control and cAMP-treated groups. A number in parentheses indicates sample size for each group. Data are presented as means ± SE.