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Immunohistochemistry of lumbar spinal cord showing upregulation of GABAb receptors [5× magnification in (A–C)], and sprouting of dopamine-beta-hydroxylase (DBH) positive noradrenergic (NE) projecting fibers in the ventral horn of the lumbar spinal cord in both types of locomotor training (E,F) compared with contused untrained controls (D; scale bar, 50 μm).
