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Human cervical spinal cord. Camera lucida drawing was made of hypocretin-immunoreactive axons in two adjacent 40 μm sections of a C4–C5 cross-section of a human cord. DH, Dorsal horn; VH, ventral horn; DC, dorsal columns; cc, central canal; LW, lateral white matter; VW, ventral white matter;LT, Lissauer’s tract. Scale bar, 1 mm.
