Fli-1 transactivation of GPIX, GPIb, and GPIIb promoter constructs. The left side of the figure diagrams the luciferase reporter constructs used in Fli-1 transactivation assays. The □ identifies Ets sites. The exact locations of the Ets boxes are identified in the text. The transfection was performed as described in Materials and Methods and the legend to Fig 1. Error bars represent deviations between duplicate samples. Each plasmid was tested in at least three independent experiments, all with essentially with the same results.