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. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source / Don W. Fawcett |
Bildgröße: | 3663 px × 2883 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |