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Newly generated oligodendrocytes in the adult macaque dentate gyrus. These two examples show cells that are immunoperoxidase double-labeled; the black reaction product in the nucleus indicates BrdU, and the brown stain in the surrounding cytoplasm indicates the expression of oligodendrocyte-specific markers, CNP (a) or O4 (b). The cell in (a) is in the GCL and the cell in (b) is in the hilus of an adult monkey, 27 days after a single BrdU injection. (Bar = 10 μm.)
