30.2 MB (1.3 MB compressed)
3575 x 2951 pixels
30.2 x 24.9 cm ⏐ 11.9 x 9.8 in (300dpi)
CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
T-lymphocyte. Coloured Transmission Electron Micrograph (TEM) of a section through a T-lympho- cyte white blood cell. At centre, the large dark nucleus is seen with yellow chromatin. The rough surface consists of microvilli-projections. Organelles are seen in the cell cytoplasm (light blue). T-lymphocytes are cells of the human immune system, produced in bone marrow and which mature in the thymus gland. There are three major types of white blood cells: granulocytes, lymphocytes and monocytes, which protect the body against invasion by foreign substances. T-cells are attacked by the HIV virus which causes AIDS. Magnification: x8000 at 6x7cm size.
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