X-gal staining for lacZ activity at embryonic stages and P1. Sections from embryos expressing Advillin-Cre and lacZ during different stages. A. trigeminal ganglia at E16.5. B. unstained DRG and traces of endogenous β-galactosidase at E18.5. C. vestibular ganglion at E18.5. D. perinatal (P1) stained DRG section. Scale bar: 1 mm.