Dorsal view of an early zebrafish embryo

Confocal micrograph of a transgenic zebrafish embryo at 24 hours post-fertilization, showing expression of the fusion protein PARD3_GFP. This means that whenever the pard3 gene is expressed green fluorescent protein (GFP) will be produced, allowing the researcher to visualise the location of this gene in development. In this image the embryo is viewed from the back (dorsally) sitting on top of a big yolk sac that provides nutrients for its development. GFP expression is seen in the surface of the neuroepithelium and thus highlights the ventricle of the brain, as well as in epithelial cells of the skin recovering the yolk.