Fig. 7. Xseb4R is regulated by proneural and neurogenic genes. (A,C,E) Dorsal views of embryos after injection of the indicated genes and stained for Xseb4R expression (dark blue). ß-galactosidase activity is shown in light blue. (B,D,F) One representative embryo for each injection series is shown at high magnification. (A,B) XNgnr1 strongly activates Xseb4R transcription in neural and non-neural ectoderm. (C,D) XNeuroD equally induces ectopic Xseb4R expression. (E,F) Activation of Notch signalling by injection of ICD-Notch reduces the expression of Xseb4R.