27.2 MB (1.6 MB compressed)
3072 x 3096 pixels
25.9 x 26.2 cm ⏐ 10.2 x 10.3 in (300dpi)
DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Dendritic cell. Coloured Scanning Electron Micrograph (SEM) of a protective cell of the human immune system known as a dendritic or Langerhans cell. The long projections seen on the 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: x2,279 at 6x6cm size. Magnification: x3,500 at 4x4 inch size.
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