We then transiently transfected GSK3β and miR-4721 mimics together into NPC cells (Figure S1D), and we found that the promotion of cell proliferation by miR-4721 mimics was attenuated, as indicated by MTT and EdU incorporation assays (Figures 5A and 5B) assays, and it also decreased the transition from G1 to S in the cell cycle (Figure 5C; Figure S2B). Here, GSK3B is linked to nasopharyngeal carcinoma.