Answer
Jellyfish are the original source of the green fluorescent protein (GFP). GFP is a naturally occurring protein that emits a bright green light when exposed to blue or ultraviolet light. Scientists have harnessed this property to create genetically modified organisms (GMOs) that express GFP, making them easy to track and study. GFP has become a valuable tool in various fields of biology, including cell biology, developmental biology, and neuroscience.