Zebrafish embryo

A dorsal view of a 3 days post fertilisation zebrafish embryo labelled with anti-calretinin antibody(green) and anti-acetylated tubulin(red) antibody that labels neuronal tracts. Calretinin is a calcium binding protein, important for calcium signalling in the brain. We can see Calretinin positive nuclei and their processes in several different regions including the olfactory bulbs, epithalamus, optic tectum and cerebellum.