Video 2. dI2 interneurons (INs): lumbar segments.

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3D reconstruction of light-sheet microscopy images of the lumbar spinal cord. In the transparent mode, dI2 axons are apparent on the contralateral side. The trajectory of two representative axons (ventral and lateral projection axons in yellow and green, respectively) was reconstructed. Significant branching is apparent. All the axons exiting the lumbar segments are visible. A coordinate system is supplied in key frames.