B. Single cell morphology of MCF7 and MDA-MB-231 cell lines, expressing or not a RASSF1C construct, cultured in 3D rat tail collagen I and analyzed for their rounded or elongated morphology 24 hours after seeding in 3D matrix. 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. 