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Figure 6: Phosphorylated PDGF β-receptors localize at the leading edge of motile cells. Migrating mouse fibroblasts are stained for the phospho-PDGF β-receptor Y1009 (a) and F-actin (b). Phosphorylated PDGF β-receptors are mainly localized at the leading edge (a, arrow). Bar represents 10 μm.