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Bioluminescence is a complex chemical reaction within a cell that releases energy in the form of light. Researchers theorize that this illumination is a form of intra-species and inter-species communication. This natural light show can be seen in a wide variety of marine organisms such as the crystal jellyfish (Aequorea aequorea) pictured here.
Image credit: Dr. Osamu Shimomura, Marine Biological Laboratory, Woods Hole, Mass
