Figure 4. Expression of sncg. sncg is not detected before stage 19, but its expression becomes detectable in the cranial nerves, and dorsal root ganglia at the tail bud and tadpole stages. A, F: Dorsal view. B-E, G: Lateral view with anterior toward the left. H-J: Transverse sections of embryos at the levels illustrated by black lines in E. drg, dorsal root ganglion; IX, cranial nerve IX; pg, pineal gland; tn, trigeminal nerve; vn, vestibulocochlear nerve; X, cranial nerve X.