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Fig. 8. The parameters of proliferation in control and differentiating A.1 and 1.3 EC cells. EC cells of both lines seeded in the same densities (2.5 x 103 cells/cm2) were cultured with and without 10-6 M RA for 24, 48, 72, and 96 h, respectively. A, growth rates. Cells were lysed in SDS-containing buffer, and the total amounts of protein were used as a measure of cell quantities. Micrograms of total protein are shown on the Y axis. Data are presented as the means of three independent experiments; bars, SE. B, the distribution of cells in cell cycle phases. Cells were fixed in Vindelovs solution, stained with propidium iodide, and analyzed using FACSCalibur equipped with ModFit 2.0 software. The percentages of cells in G1, S, and G2 phases are expressed as the means of three independent experiments; bars, SE.