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Anti-neuropilin-1 staining of growth cones extended from DRGs cultured overnight in 10−9m NGF (A), 5 × 10−9m NGF (B), and 10−8m NGF (C). Fluorescent anti-neuropilin-1 staining is more intense on growth cones raised in 5 × 10−9 or 10−8m NGF. Scale bar, 10 μm.
