Fig. 3From: Radio-protective effect and mechanism of 4-Acetamido-2,2,6,6- tetramethylpiperidin-1-oxyl in HUVEC cellsThe radioprotective effect of AA-Tempol on the viability of irradiated HUVEC cells was examined using clonogenic survival assay. Pretreatment of different concentrations (0, 1 and 2 mmol⋅L−1) of AA-Tempol 1 h prior to X-radiation provided significant protection compared to cells treated with radiation alone (P < 0.05)Back to article page