Effect of RPS15A knockdown on cell cycle distribution of U2OS cells. (A) DNA histogram of cell cycle distribution of U2OS cells with three treatments [Con, Lv-shCon, and Lv-shRPS15A(S1)]. (B) Statistical analysis of the cell population in G0/G1, S, and G2/M phases. Con, no lentivirus treatment; Lv-shCon, control lentivirus; Lv-shRPS15A, lentivirus containing an shRNA targeting RPS15A. **p<0.01, ***p<0.001.