19.5 MB (1.5 MB compressed)
2273 x 3006 pixels
19.3 x 25.4 cm ⏐ 7.6 x 10.0 in (300dpi)
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 long dendritic or Langerhans cell is seen at lower left stretching to top right. Dendritic cells are phagocytic cells which are found in the epidermis. The cell recognises foreign proteins (antigens) and ingests them into Birbeck granules in its cytoplasm, "processing" the antigen and then secreting it to be dealt with by other immune cells. At top right is a rounded T-cell, a lymphocyte white blood cell which actively seeks out and destroys micro- organisms like viruses. Some T-cells are known as killer T-cells. Magnification: x800 at 6x7cm size.
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