Confocal micrograph of an intact Drosophila larva imaged through the translucent cuticle showing the innervation of the dorsal (towards the back) muscle fibres by motor nerves. The muscles have been g...

The developing wing bud of a four day chick embryo showing the pattern of spinal nerves growing into it. The nerves are made visible by staining a specific neural protein (3AIO monoclonal antibody, wh...