50.2 MB (50.0 MB compressed)
4878 x 3595 pixels
41.4 x 30.5 cm ⏐ 16.3 x 12.0 in (300dpi)
EDELMANN / SCIENCE PHOTO LIBRARY EDELMANN / SCIENCE PHOTO LIBRARY
False-colour transmission electron micrograph (TEM) of a single, activated cytotoxic ("killer") T-lymphocyte (left, a class of white blood cell) delivering the "kiss of death" to its target cell. T-lymphocytes are involved in cell-mediated response to invasion of body by foreign microorganisms, notably viruses and some bacteria, which are protected from antibodies (secreted by B-lymphocytes) by their host cells. T- cells recognize antigens on their target cell & bind to the surface membrane. Dark vesicles at edge of T-cell contain enzymes that penetrate the target cell membrane & destroy the cell.
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