USP14 and hepatocellular carcinoma: To further verify whether ablation of USP14 or/and a selective deubiquitination activity inhibitor of USP14 (IU1) could restrain HCC growth in animals, we implanted subcutaneously USP14-depleted HCCLM3 cells stably expressing USP14-specific shRNA (shUSP14) or control shRNA (shCtrl) and monitored tumor growth as they were treated with IU1 or vehicle (Figure S4A, B).