RNA-FISH was performed according to the protocol of the RNAscope Multiplex Fluorescent v2 Assay (cat: 323110, Acdbio), which detects single mRNA molecules. In briefly, E9.5 embryos were fixed for 20–30 h in 4% paraformaldehyde and then dehydrated in methanol. The following probes were used: mm-Sox10-C2 (cat: 43591-C2, Acdbio), mm-Robo2-C1 (cat: 475961, Acdbio). Whole-mount and sections RNA-FISH were performed as previously described73 (link). Embryos were imaged using an AxioZoom.V16 microscope (Zeiss) with ×40 objective and photographed with an Axiocam digital camera (Zen 2011, Zeiss). Sections were examined using an Apotome (Zeiss), 10X objective and photographed with an Axiocam digital camera (Zen 2011, Zeiss).
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