(A) Corticospinal axons (CST) labeled for BDA are present within neural stem graft labeled for NeuN. Nine months after grafting. Horizontal section; dotted lines indicate rostral host-graft border. Scale bar, 50 μm.
(B) BDA-labeled corticospinal axons (CST) regenerate among Prdm8-expressing (V0–2) pre-motor interneurons in grafts. Scale bar, 50 μm.
(C) Corticospinal axons (CST, red) form close appositions with the surface of Prdm8-expressing (cyan) graft neurons. Scale bar, 10 um.
(D) BDA-labeled corticospinal axon (CST) density is generally attenuated in regions of Tlx-3 sensory interneuronal clusters. Dotted lines indicate sensory interneuronal domains. Left, rostral; right, caudal. Scale bars, 100 μm.