Effects of pravastatin, paroxetine and their comedication on the levels of serum 5-HT (A), pancreas insulin (B), pancreas 5-HT (C), Insulin-2 mRNA (D) and Tph-1 mRNA (E) of pancreas in rats after the treatments. Data represent the mean±SEM of 4 rats. bP<0.05, cP<0.01 vs CON rats. eP<0.05, fP<0.01 vs DM rats. hP<0.05, iP<0.01 vs DM-PR rats.