Fig. 7

Cell apoptotic index (a) and cell cycle analysis (b) of human endothelial cells exposed to HA particles (10 and 50 μg/mL)—representative flow cytometry histograms and quantitative data. HAp2 caused a small increase in the % of early apoptotic cells and in the % of cells in the S-phase and G2/M-phase. *Significantly different from control (absence of particles); p ≤ 0.05