Fig. 2From: Zinc promotes cell apoptosis via activating the Wnt-3a/β-catenin signaling pathway in osteosarcomaSelection of concentrations for ZnSO4 treatment in U-2OS cells via MTT assay. *p < 0.05, **p < 0.01, ***p < 0.001 compared with the control group. n = 4 per groupBack to article page