I. Lung colonization of MDA-MB-231 CFP+ cells (MDA-MB-231CFP) stably expressing control or HA-RASSF1C in mammary gland tumors from 5 mice each, measured from intravital imaging time-lapse images. Data information: All data are from n=3 independent experiments. Data are analyzed by Student T-test and represented as mean ± SEM.* p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001. 