Axonal tracts and neuropil in zebrafish embryo

Confocal micrograph of a 4 day old zebrafish larvae labelled with tubulin(green) and anti-SV2 (magenta) antibodies to label axonal tracts and neuropil (clusters of axons) respectively. The larval brain is already well developed with most major tracts established at this stage of development. Width of image is 700 micrometres.