Sensory axons (long, slender nerve fibers) covering the tail of a 3- day-old larval zebrafish. This "Brainbow" image was collected using confocal microscopy. In the Brainbow technique (Nature, 2007), cells randomly choose combinations of red, yellow and cyan fluorescent proteins, so that they each glow a particular color. This provides a way to distinguish neighboring cells of the nervous system and follow their pathways. Seventh Prize, 2009 Olympus BioScapes Digital Imaging Competition®.