ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Leptin molecule. Computer model of a molecule of leptin, a protein produced by white fat cells in adipose tissue. Leptin controls the amount of white adipose tissue that is laid down in the body, and acts on the brain as a signal to regulate appetite. Mutations in the ob gene that codes for leptin are thought to be responsible for some forms of obesity.
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