Figure 1From: TGF β1 and PDGF AA override Collagen type I inhibition of proliferation in human liver connective tissue cells Contact inhibition of proliferation. A. Proliferation of normal human skin fibroblasts (SF) in vitro. B. Proliferation of human liver connective tissue cells (LCTC). Cells were plated at 1 × 103 cells/cm2. Each day, during a period of 8 days, cells were trypsinized and counted in a hemocytometer (n = 3). Medium containing 10% serum was replaced every two days. C. [H3]-Thymidine incorporation in SF and LCTC at increasing cell density (n = 4).Back to article page