Video 1. dI2 interneurons (INs): transverse sections of lumbar segments.

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Caudal to rostral transverse images of light-sheet microscopy images along the lumbar segments of an embryonic day (E) 13 spinal cord expressing Cherry in dI2 neurons (a reference to the location of the section is shown at the bottom left). dI2 cell bodies and axons are visible. Examples of large- and small-diameter dI2 neurons are indicated by arrows. The concentration of axons on the side contralateral to electroporation is clear.