Fig. 3. Cell cycle progression of MMH cell types and expression of marker proteins. (A) Proliferation kinetics of epithelial (MMH-D3, circles; MMH-R, squares) versus fibroblastoid MMH-RT cells (triangles). (B) Protein abundance of representative components participating in intercellular communication in epithelial and fibroblastoid cells. Besides the exogenous expression of Ha-Ras in epithelial MMH-R and fibroblastoid MMH-RT cells, the downregulation and loss of respective markers is indicated in fibroblastoid cells by immunoblotting.