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Figure Caption

Figure 8—figure supplement 1. In situ hybridization showing the absence of Schwann cells in the spinal cord of a control sibling (n = 20 larvae), and the presence of <italic>krox20<sup>+</sup></italic> Schwann cells (white outlined arrowheads) in the ventral and dorsal spinal cord in a <italic xmlns:xlink='http://www.w3.org/1999/xlink'>neuroD:gal4;UAS:hNrg1</italic> larva at 4 dpf (n = 20 larvae).

Zrf1 immunostaining shows GFAP+ radial glia and denotes the outline of the spinal cord. Scale bar, 10 µm.

Acknowledgments
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