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Immunofluorescence staining of cells undergoing apoptosis (red) in the midbrains of p18 msd mice. These cells are stained by antibodies to different oligodendrocyte-specific markers: O4 (a), Ranscht (b), PLP (c), and MBP (d). Bars: (a–c) 10 μm; (d) 2 μm.
