Dopaminergic neurons in the zebrafish forebrain. Confocal micrograph of a 4 day old transgenic zebrafish embryo viewed from a lateral aspect. Neurons in the olfactory bulb, telencepahlon, ventral diencephalon, pretectum and hypothalamus are labelled in green. Axonal tracts are shown in cyan and neuropil in magenta. In order to show the anatomy of the brain better the skin and eyes of the embryo have been removed post-fixation.