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FIGURE 1. (A) Changes in S phase fraction as function of time after subculturing of growth-arrested A549 cells into fresh culture medium. (B) Uptake of 3H-FLT in A549 cells as function of time after 8-d-old growth-arrested cells were subcultured into fresh growth medium. FLT uptake is expressed relative to activity levels in culture medium. Uptake equal to 100% represents equilibration between cells and medium, whereas higher values mean that cells have concentrated tracer. (C) Uptake of 3H-FLT in A549 cells versus percentage in S phase.
