noun
a protein found in certain jellyfish that emits light when it binds with calcium ions
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Aequorin is a photoprotein found in certain jellyfish species that emits blue light when bound to calcium ions.
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I heard aequorin is what makes jellyfish glow in the dark.
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Yo, did you see that jellyfish? It's like they got some aequorin magic going on.
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Her smile lit up the room like aequorin in the deep sea.