Protein extraction and immunoblotting were performed as previously described [19 (link)]. The following antibodies were used: rabbit polyclonal anti-FOXF1 (Abcam #ab23194, 1:500), rabbit monoclonal anti-p21 (Cell Signaling Technology #2947, 1:2000), mouse monoclonal anti-cyclin A2 (Cell Signaling Technology #4546, 1:1000), rabbit polyclonal anti-cyclin B1 (Cell Signaling Technology #4138, 1:1000), rabbit polyclonal anti-cyclin E2 (Cell Signaling Technology #4132, 1:750), and mouse monoclonal anti-β-actin (Millipore #MAB1501, 1:10000).
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