NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
Obesity research. Researcher holding two rats that are part of an obesity study. The rat on the right is normal, with a weight of 550 grams, the rat on the left is obese, with a weight of 1445 grams. Photographed at the National Institute of Arthritis and Musculoskeletal and Skin Diseases, in 1955.
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