"Brainbow" zebra fish.
Neurons are labeled in multiple colors with Brainbow fluorescence microscopy. Three fluorescent proteins (cyan, yellow and red) are randomly taken up by various neurons, offering a palette of dozens of colors to help scientists follow complex neural pathways. Shown here is a five-day-old zebra fish larva viewed from the dorsal side, captured using a 20X objective
Image credit: Dr. Albert Pan, Harvard University, Cambridge, Mass.
Source: http://www.scientificamerican.com/slideshow.cfm?id=bioscapes-contest-photos#4
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