Two dendritic immune cells

Two dendritic immune cells

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Credit: DAVID SCHARF/SCIENCE PHOTO LIBRARY

Caption: Dendritic cells. Coloured Scanning Electron Micrograph (SEM) of protective cells of the human immune system known as a dendritic or Langerhans cells. Long projections seen on each cell's sur- face are "feet" to help it move. Dendritic cells are found in the upper layer of the human skin (the epidermis). When the epidermis is infected, these cells recognise and engulf any foreign proteins (called antigens). Once within the cell, the foreign antigen is "processed" before being released once again into the epidermis. The processed antigen then acts like an alarm signal, alerting other immune cells of the body to the infection. Magnification: x1,720 at 6x7cm size. Magnification: x2,900 at 4x5 inch size.

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Keywords: anatomy, defence, dendritic cell, human body, immune system, immunology, langerhans cell, phagocyte

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