Staining was performed as previously reported (39 (link)). In brief, tissue sections were cut at 4μm and deparaffinized in xylene and absolute alcohol. Endogenous peroxidase activities were blocked with a solution of 3% hydrogen peroxide and absolute alcohol 1:1 for 15 minutes. Heat induced antigen retrieval was performed with a pressure cooker (122+/−2°C) for 45 seconds at 15+/−5 PSI in citrate buffer (pH6.0). Immunohistochemistry was performed using a polyclonal rabbit antibody to FOXJ1 (HPA005714, Sigma-Aldrich) at a dilution of 1:75 incubated for 45 minutes at room temperature followed by labeled polymer-HRP anti-rabbit IgG incubated 30 minutes and visualized with 3,3′-Diaminobenzidine (DAB) (brown in color: Dako Envision System). The slides were counterstained with hematoxylin. Images were acquired using an Olympus BX41 microscope and an Olympus DP26 digital camera.