Fluorescein (lactone form) is a xanthene dye that is highly fluorescent, detectable even when present in minute quantities. Used forensically to detect traces of blood, in analytical chemistry as an indicator in silver nitrate titrations and in microscopy.
The light emission is coming from fluorescent proteins that scientists have introduced into the animals so that when some part of their body is made as they develop, they also make the fluorescent protein. The scientists didn't do that just because they were bored and wanted to make cool pictures.
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