Effects of Fhit reexpression on the cell cycle. Distribution of H460 cells in the cell cycle was analyzed by propidium iodide staining. The percentage of cells in G0/G1, S, and G2 was, respectively, 81.6%, 12.4%, and 6% for Ad5-lacZ-infected cells (lacZ) and 80.2%, 6.6%, and 13.2% for Ad5-Fhit-infected cells (Fhit) 3 days postinfection (3d) and 84.4%, 10.1%, and 5.5% (lacZ) and 71.5%, 27.5%, and 1% (Fhit) 5 days postinfection (5d).