A,B: The majority of Tg(atoh1c∷kaede)+ cells (green) in the atoh1c mutant are located within the URL and do not express HuC/D (red) at 5 dpf (B) indicating that they are not post-mitotic neurons. C,D: atoh1cfh367 cells (green) in the URL are positive for NeuroD1 (red, D). E,F: atoh1cfh367 cells (green) in the URL do not incorporate EdU (red, F). Strong EdU incorporation anterior to the cerebellum in both wild-type and mutant is in the optic tectum (OT). Dorsal views with anterior to the left. Scale bars: 50 μM.