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Schematic images of transverse sections through the trunk of E9.0 (A), E10.5 (B), E12.5 (C), E14.5 (D) and E18.5 (E) embryos, and a longitudinal section through the postnatal sciatic nerve (F). Insets in C-F show transverse sections through the sciatic nerve. bc, boundary cap; dr, dorsal root; drg, dorsal root ganglia; nt, neural tube; sn, spinal nerve; vr, ventral root.
