 cell cycle analysis was performed. The x-axis indicates the phase of the cell cycle. The y-axis indicates the proportion of the cell population. Values shown are mean ± SD (n=0). (A) shows the data for the cell lines MDA-MB000S, BT000, MCF0, and KMST-0. Data for the other cell lines are shown in [Table I](#tI-or-00-00-0000){ref-type="table"}. Differences in G~0~ and S phases between normal and starvation conditions were analyzed using t-test. 