[³H]-thymidine incorporation (A) and adhesion to FN (B) of nontransfected Baf3 cells (designated as Baf3/c), wild-type H-Ras–transfected Baf3 cells (designated as wild-type), constitutively active type H-Ras–transfected Baf3 cells (designated as constitutively active), and dominant-negative type H-Ras–transfected Baf3 cells (designated as dominant-negative) in the presence or absence of various concentrations of IL-3. Data represent the mean (±SD) of triplicate samples from one of three representative experiments. *P value (P < .01) comparing proliferation or adhesion with those of wild-type H-Ras–transfected Baf3 cells.