DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Light micrograph (LM Fluorescence) of a transformed bacteria colony (Escherichia coli) containing a jellyfish gene for GFP (green fluorescent protein). GFP is a 238 amino acid protein found in the Pacific jellyfish (Aequorea victoria). It exhibits a bright green fluorescence (green bioluminescence) when exposed to ultraviolet blue light. GFP is widely used as a research tool in biology and medicine. The gene coding for GFP can be tagged to the genes of other proteins or viruses to study their movements within cells. GFP can also be used to tagged cancer cells to track their spread through the body. The purpose of both bioluminescence and GFP fluorescence in jellyfish is unknown. Magnification: x20 when shortest axis printed at 25 millimetres.
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