DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Dendritic and T-cells. Coloured Scanning Electron Micrograph (SEM) of two types of protective cell of the human immune system. A large dendritic or Langerhans cell is seen with a T-cell attached (at upper centre). Dendritic cells are found in the skin. They recognise foreign proteins (antigens) and ingest them into cytoplasmic Birbeck granules. Antigens are then "processed" and secreted out of the cell, to be dealt with by other immune cells. T-cells are a type of white blood cell, known as lymphocytes. These seek out and destroy invading microorganisms. Magnification: x2,965 at 5x7cm size. Magnification: x5,000 at 4x5 inch size.
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