Bioluminescence is the ability of certain organisms to produce their own light through a chemical reaction. This phenomenon is common among deep-sea creatures living in total darkness. Fireflies also use bioluminescence, though for a different purpose: attracting mates. Scientists have even adapted the underlying chemistry for use in medical research. In laboratories, glowing proteins help researchers track specific cells within the body. According to the passage, bioluminescent chemistry has been useful in which field?
