JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Immature lung, light micrograph. Alveolar ducts from an immature lung showing a deposit of fibrin, abundant red blood cells, leukocytes and macrophages (mostly in the right half). Note the thickening of the immature alveolar walls. Magnification: x90 when printed at 10 centimetres wide.
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