fig4
Figure 4. Effect of 1 or 2 mM pentoxifylline 48 h treatment on the cell cycle profile of (A) NCI-H460 vs. (B) NCI-H460/R and (C) A549 vs. (D) A549-CDR2 cell lines, analyzed by flow cytometry. The frequency of the cell cycle phases (top panels), as well as the representative cell cycle histograms (bottom panels), are presented. *P ≤ 0.05; **P < 0.01.
