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Figure 2: Oligoastrocytoma, grade II (OA): Histomorphology (a, H and E; ×100) with nonpositivity for p53 protein (b, IHC; ×200) and codeletion for 1p (c, FISH; ×1000) and 19q (d, FISH; ×1000). (e-h) Anaplastic oligoastrocytoma, grade III (AOA): Histomorphology (e, H and E; ×100) with positivity for p53 protein (f, IHC; ×100) and nondeletion for 1p (g, FISH; ×1000) and 19q (h, FISH; ×1000)

Figure 2: Oligoastrocytoma, grade II (OA): Histomorphology (a, H and E; ×100) with nonpositivity for p53 protein (b, IHC; ×200) and codeletion for 1p (c, FISH; ×1000) and 19q (d, FISH; ×1000). (e-h) Anaplastic oligoastrocytoma, grade III (AOA): Histomorphology (e, H and E; ×100) with positivity for p53 protein (f, IHC; ×100) and nondeletion for 1p (g, FISH; ×1000) and 19q (h, FISH; ×1000)