Effects of Urantide on U-II and GPR14 mRNA expression in vascular smooth muscle cells. 1: Marker; 2: Control group (group C); 3: U-II group (group M); 4: Positive control group (Flu group); 5-9: 10-10, 10-9, 10-8, 10-7, and 10-6 mol/L Urantide group. *p<0.05, **p<0.01 vs group C; #p<0.05, ##p<0.01 vs group M.