The crystal jellyfish is a hydrozoan jellyfish found off the west coast of North America. It is colorless and almost completely clear during the day. However, at night it puts on a spectacular glowing light show.
Crystal jellyfish produce flashes of alternating blue and green colored light at points along the outsides of their bells produced by releasing calcium-reacting photoproteins.
Scientists have isolated the crystal jellyfish proteins and are using them in medical research, pursuing cures for cancers and genetic diseases.