All DNA constructs were made in the corresponding author’s laboratory and verified by DNA sequencing and/or restriction enzyme analysis. Chemicals were purchased at molecular biology or analytical grade purity from established vendors (e.g., Sigma-Aldrich, VWR). Enzymes were obtained from Promega or New England Biolabs. The following antibodies were used for western blotting or immunoprecipitation: anti-Flag M2 (Sigma-Aldrich F1804), anti-Myc 9E10 (Sigma-Aldrich M4439), anti-cyclin D1 DCS6 (Cell Signaling #2926), anti-SMAD4 B-8 (Santa Cruz sc-7966) and anti-actin (GenScript A00730) mouse monoclonal antibodies; anti-ETV1 (Abcam ab81086 or our previously described #959 antibody9 (link)), anti-p21 H-164 (Santa Cruz sc-756), anti-PMEPA1 2A12 (Abnova H00056937-M01) and anti-SMAD3 (Zymed 51–1500) rabbit polyclonal antibodies; and anti-p-SMAD3-Ser423/425 C25A9 (Cell Signaling #9520) rabbit monoclonal antibodies.
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