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Effects of BDNF, IGF-1, BDNF/IGF-1(BI), PDGF, bFGF, PDGF/FGF (PF), or combined (M) on fetal OPC. Cells grown under the indicated growth factor supplemented conditions were stained with O4 and GC antibodies at the indicated time point. Top panel represents the percentage of O4+ cells as fold of control condition (DFM); bottom panel represents the percentage of GC+ cells as fold of control condition (DFM).