CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Cross-section of a pulmonary alveolus or air sac in the human lungs. Researchers have re-engineered the immune system protein properdin (green) to activate the Complement System, a component of the immune system. The altered properdin greatly increases the number of phagocytes (yellow) responding to the invasion of microbes such as Streptococcus pneumonia (blue). Labelled.
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