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Expression of PDGFRα (A,E; Pα) and NG2 (B,F) on oligodendrocyte progenitors (OPC, arrowhead) and APC (visualized with the CC1 antibody) on mature oligodendrocytes (C, G) of wild type (WT) and NG2-null (KO) pups at the 21st postnatal day (P21). PDGFRα and NG2 (arrow) were down-regulated on mature APC oligodendrocytes (D; blue). Scale bar: 20 μm.
