Immunophenotype of Pten; p53 cKO HGAs. (A–C) Sections from a brain containing anaplastic astrocytoma were immunostained for pAkt S473 (A, brown), Ki67 (B, purple) and active Caspase-3 (C, purple), counterstained with hematoxylin (A) or methyl green (B, C). The dashed line indicates the approximate interface between normal cerebral cortex above and tumor below. (D–F) IHC (brown) of anaplastic astrocytoma for Gfap (D), the light chain of Neurofilament (E) and Nestin (F), counterstained with hematoxylin. The arrow in (E) indicates the soma of a neuron. (G–I) H&E stain showing tumors in the cerebellum (Cbl), spinal cord (SpC) and growing as an exophytic mass from the pons. Scale bar in (D) is 50 μm and applies to (A–F). Scale bars in (G, H) are 200 μm. Scale bar in (I) is 1 mm. See also .