CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Digital illustration of bloodstream with molecular models of ketone bodies: acetone (upper centre), acetoacetic acid (lower left) and beta-hydroxybutyric acid (lower right). These are the three water-soluble compounds that are produced as by-products when fatty acids are broken down for energy in the liver and kidney. They are a source of energy for the heart and brain. In this image, carbon molecules are black, hydrogen molecules are white, and oxygen molecules are red.
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