Fig. 2. Effects of alterations of let-7a levels in neural stem cells. A TaqMan assay was performed to check let-7a level. The level of let-7a decreased in the agmatine group compared with the let-7a mimic group. U6 was used as an internal control. Data are expressed as mean±SEM. ^*p<0.05, ^†p<0.001 compared to normal control group. let-7a mimic, let-7a mimic treatment/let-7a overexpression group; let-7a inhibitor, let-7a inhibitor treatment/let-7a suppression group; Agm, 100 µM agmatine treatment group; Veh, Lipofectamine treatment group.