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Histological and immunohistochemical features of IDH2-R172K Mut and 1p/19q codeleted anaplastic oligodendroglioma. Hematoxylin and eosin stained section at 20× (Scale bar = 50 μm) (a) and 40× magnification (Scale bar = 20 μm) (b). c IDH1-R132H staining is negative. d Retained nuclear ATRX staining. e p53 staining is negative. f Retained nuclear H3K27me3 staining. Magnification is 20× for c–f
