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The green fluorescent protein (GFP) is a protein that exhibits bright green fluorescence when exposed to light in the blue to ultraviolet range. The label "GFP" traditionally refers to the protein first isolated from the jellyfish "Aequorea victoria" and is sometimes called "avGFP". However, GFPs have been found in other organisms including corals, sea anemones, zoanithids, copepods and lancelets.