You may not have heard of it, but the hydromedusa Aequorea victoria is probably the most influential bioluminescent marine organism. Calcium-activated photoprotein and green-fluorescent protein (GFP) were first discovered and cloned from this cnidarian. This picture does not show bioluminescence or fluorescence. (See the link above for a fluorescence image, and read Claudia Mills web page for an in-depth discussion.)

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