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Luciferase reporter assays of synergistic promoter up-regulation. (A) Bmp4 promoter-reporter constructs (p2.4 Bmp4-luciferase) or (B) Msx1 promoter-reporter constructs (p3.5 Msx1-luciferase) were co-transfected with the different Msx1 expression vectors and the wild-type Pax9 expression vector at a 1:2 ratio. (Error bars represent standard error; *p < 0.05, **p < 0.01.)
