Figure 4.

Direct immunofluorescence flow cytometry was performed to detect intracellular expression of Bcl-2 on CD34+ cells. Cells from normal subjects and asthmatic patients were incubated with or without 5 μg ml⁻¹ theophylline for 24 h. The graph shows data expressed in the form of histogram depicting specific Bcl-2 staining with (dashed line) or without (solid line) theophylline treatment for a normal subject (a) and for an asthmatic (b).