Figure 2: Flow cytometry analysis of cell cycle progression in young, SIPS, and control senescent HDFs (a). Quantitative analysis of cell cycle progression in control young HDFs, SIPS, and control senescent HDFs. Cell population in the G0/G1 phase was significantly increased while S phase cells decreased in SIPS and control senescent HDFs (b). adenotes compared to control young HDFs, bP<0.05 compared to SIPS. Comparison was done between HDFs in the same phase of cell cycle. Data is presented as mean SD, .