(A) Gene expression of SMAD4, ID3, COL1A1, CTGF, SMAD6 and SMAD7 in untransfected cells treated with or without TGFβ1 or BMP4. (B) Gene expression in cells transfected with WT-SMAD4, SMAD4-I500V or WT/I500V. (C) Gene expression in cells treated with TGFβ1 for 2 hours in cells transfected with WT-SMAD4, SMAD4-I500V, or WT/I500V. (D) Gene expression in cells treated with TGFβ1 for 48 hours in cells transfected with WT-SMAD4, SMAD4-I500V, or WT/I500V. (E) Gene expression in cells treated with BMP4 for 2 hours in cells transfected with WT-SMAD4, SMAD4-I500V, or WT/I500V. (F) Gene expression in cells treated with BMP4 for 48 hours in cells transfected with WT-SMAD4, SMAD4-I500V, or WT/I500V. Differences in expression between WT-SMAD4, SMAD4-I500V, or WT/I500V -transfected cells were statistically analyzed by one-way ANOVA and presented as mean ± SD, ** p < 0.01, *** p < 0.001, **** p < 0.0001; n = 3.