JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Light micrograph a bronchiole branching into alveolar ducts in an immature lung. The lumen of bronchiole, alveolar ducts and alveoli show deposits of fibrin, some red blood cells and macrophages. Magnification: x90 when printed at 10 centimetres wide.
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