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The fact that the P-Glo gene from a jellyfish can be taken and inserted into bacteria, and the bacteria will glow, is proof that there is a universal genetic code common to all organisms including jellyfish and bacteria. This is possible because the genetic code is the same for all living organisms on Earth, from bacteria to humans. The P-Glo gene codes for a protein called green fluorescent protein (GFP), which glows when exposed to blue light. This discovery has revolutionized molecular biology and has allowed scientists to study gene expression in real-time.