Expression of Cas genes in the developing dorsal root ganglia and spinal cord. (a–c) Whole-mount in situ hybridization for p130Cas, CasL and Sin in e10.5 embryos. White arrows mark the trigeminal ganglion, black arrows mark the nodose/petrosal compex, and red arrows point at DRG examples. (d–o) Transverse sections through embryonic spinal cords stained by in situ hybridization with probes against p130Cas (d,g,j,m), CasL (e,h,k,n) and Sin (f,i,l,o), at e11.5 (d–f), e12.5 (g–i), and e14.5 (j–o). Cas genes show overlapping expression in the DRGs (dotted line and black arrowhead) and dorsal spinal cord (red arrowheads). No staining was detected for the sense probes (m–o). VR: ventral roots. Scale bars: 500 μm for (a–c); 100 μm for (d–f); 200 μm (g–i) and 100 μm (j–o).