DON W. FAWCETT / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Transmission electron micrograph (TEM) of a T-lymphocyte. T lymphocytes are white blood cells that play a critical role in the human immune response against viruses, bacteria, parasites, and tumours. T cells can recognize foreign antigenic peptides (short protein segments) from pathogens and tumour cells via a cell surface receptor called the T-cell antigen receptor or TCR. This recognition activates the cells into their defensive role.
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