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Fig. S1 This series of images further show that Schwann cells are absent in along the trunk of the fish with a homozygous Tg[gSAGFF-202A] insertion. While EGFP (green) in Tg[gSAGFF-202A;UAS:EGFP] heterozygous fish at 96 hpf is expressed in Schwann cells surrounding the lateral-line afferent axons labeled with and antibody to acetylated tubulin (turquoise), the EGFP signal is absent from the perineurium, and appears upregulated in neuromasts in Tg[gSAGFF- 202A;UAS:EGFP] homozygous fish. The lateral line contains hair cells, which were labeled with an antibody to S100 (red). Cellular nuclei were labeled with DAPI (blue).