Fig. 1From: Shock wave-induced ATP release from osteosarcoma U2OS cells promotes cellular uptake and cytotoxicity of methotrexateDetermination of the optimal experimental conditions of shock waves for human osteosarcoma U2OS cells. U2OS cells were treated with the indicated number of shock at the voltage of 7 kV (a) or 14 kV (b). The cell viability was assessed by trypan blue exclusion assay. Data are mean ± SD, n = 5, *p < 0.05, Student,s t-testBack to article page