T lymphocytes and spirochaete bacterium. Coloured scanning electron micrograph (SEM) of two T lymphocyte white blood cells (round) with a single spirochaete bacterium (long, thin). T lymphocytes (T cells) are white blood cells (leucocytes) that play a critical role in the human immune response against viruses, bacteria, parasites, and tumours. They can recognise foreign antigenic peptides (short protein segments) from pathogens and tumour cells via a cell surface receptor called the T-cell antigen receptor. This recognition activates the cells into their defensive role. Magnification: x10, 000, when printed 15cm wide. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / EYE OF SCIENCE |
Bildgröße: | 4705 px × 3714 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
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