H. Quantification of rounded versus elongated cells in single cell morphology assay in 3D‑collagen indicating the degree of mesenchymal-amoeboid transition of MDA-MB-231 cells when RASSF1C or the described mutants are expressed. I. Representative confocal images show elongated or rounded cells per field of view of MDA‑MB-231 cells transfected with DsRed, DsRASSF1C, DsRASSF1C-R197W or DsRASSF1C-R199F, grown in 3D‑collagen and stained with Phalloidin-568 (red) for F‑actin and pMLCII/Alexa 633. Scale bars represent 10 μm. 