Figure 3: Effect of Y-27632 (A), roscovitine (B), tyrphostin AG879 (C), and chelerythrine chloride (D) on collagen gel contraction induced by 0.5% or 2% Fetal Bovine Serum (FBS) and on cell viability. Various concentrations of inhibitors were added and cells were cultured on collagen gels in the presence of FBS at a concentration of 0.5% or 2%. The areas of collagen gels were measured and data are shown as % of collagen gel area without FBS. Open bars indicate 0.5% FBS-stimulated contraction and solid bars indicate 2% FBS. Symbols, - or + indicate absence or presence of FBS. Dotted line indicates cell viability (%). Data represent the mean SE of triplicate measurements. *P<0.05, *P<0.01 versus 0.5% FBS alone, #P<0.05, ###P<0.005 versus 2% FBS alone.