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Figure Caption

Figure 7—figure supplement 1. MEP glia are absent along the motor root in <italic>nrg1</italic> mutant larvae.

(A) In situ hybridization showing plp1a+ oligodendrocytes in the spinal cord (outlined arrowheads) in nrg1+/+ larvae and in both the CNS (outlined arrowheads) and the PNS (arrowhead) in nrg1-/- larvae at 3 dpf. (B) Dorsal view of the zebrafish trunk showing wif1+ MEP glia in WT and nrg1-/- larvae at 3 dpf. wif1+ MEP glia are located at the edge of the spinal cord (white outlined arrowheads) in WT larvae while their location is lateral (white arrowheads), close to the skin, in nrg1-/- larvae. Yellow brackets denote the width of the spinal cord. White dashed lines denote the trunk. Scale bar, (A) 10 µm, (B) 250 µm.

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