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Light sensors

In the laboratory, the skin of zebrafish (Danio rerio) larvae becomes covered in green glowing dots when exposed to certain drugs or pollutants. The effect is caused by an enzyme with a fluorescent tag that transforms the fish into environmental sensors, or in this case, into useful aids for studying the anti-inflammatory effects of a molecule with pharmaceutical potential isolated from the venom of another species.

Image submitted by Geonildo Rodrigo Disner, a postdoctoral researcher with the Zebrafish Platform at the Butantan Institute