CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration showing the production of Adenosine triphosphate, or ATP, which transports chemical energy within cells for metabolism. High energy bonds are indicated in yellow. Highlights in the background cells show the movement of oxygen and glucose to the mitochondria where ATP production takes place and carbon dioxide moves out of the cell. Black = carbon, white = hydrogen, red = oxygen, blue = nitrogen, orange = phosphorus.
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