Zebrafish hindbrain showing the ventricular zone, where cells are proliferating, in red, and the zone of differentiating neurons in green.

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Zebrafish hindbrain showing the ventricular zone, where cells are proliferating, in red, and the zone of differentiating neurons in green. Dr Jonathan Clarke. Source: Wellcome Collection.