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FIG 3. A and B, Photomicrographs from immunohistochemistry of endothelial cell marker (CD31) in low-grade gliomas (CD31 stain; original magnification, X400). Grade II astrocytoma (A) shows minimal reactivity with CD31 antibody compared with a grade II oligogdendroglioma (B), which demonstrates strong reactivity as shown by the brown staining of the vasculature.
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