Fig. 7. Ectopic expression of chick Snail increases neural crest production in the chick hindbrain. Electroporations were carried out as described in the legend to Fig. 1. (A) GFP expression and (B) DiI labelling to visualise the neural crest cells that have emigrated from the hindbrain. C illustrates a similar embryo showing rhoB expression (blue). This embryo was also hybridised with a neomycin probe to detect the electroporated area (pale red). (D) A high power view showing the increase in premigratory and migratory neural crest (arrowheads). (E,F) Sections taken from the same embryo at the levels indicated by the dotted lines in C.