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For immunostaining, two tumors were fixed and embedded in paraffin. Tissue sections (4 μm thick) were cleared and dehydrated, treated with 3% hydrogen peroxide, and then treated with a dilution of 1:10 normal rabbit serum (Vector Laboratories). Antibody to synaptophysin (Boehringer-Mannheim) was used at a dilution of 1:5 and antibody to neurofilament protein (Dako) at 1:50. Antibody binding was visualized with a peroxidase Vectastain Elite ABC kit (Vector Laboratories). Nuclei were counterstained with hematoxylin. As with anti-synaptophysin staining, anti-neurofilament staining appeared in processes of the tumor cells.
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We thank D. Kingsley, S. McConnell, and G. Barsh for help with this project; D. Horoupian for advice on medulloblastoma histology; D. Jung and N. Jiang for technical assistance; A. Oro for helpful discussions; K. Wharton and L. Havton for advice and tissue samples; D. Anderson, P. Gruss, R. Krumlauf, A. McMahon, A. Nagy, J. Rossant, J. Rubinstein, A. Simeone, and D. Wilkinson for research materials; and the Protein and Nucleic Acid facility at Stanford for DNA help. L.V.G. is supported by an Howard Hughes Medical Institute predoctoral fellowship. This research was supported by the Howard Hughes Medical Institute. Mouse work was done according to Animal Use Guidelines at Stanford University.
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