The immune system protects the body against pathogens such as bacteria, viruses, fungi, and parasites, when they pass the first line of body defence such as the skin or other epithelial and mucosal barriers. After penetration into the body, micro-organisms encounter the second line of defence. This concerns the so-called aspecitlc immune system, which consists of phagocytes, such as macrophages and granulocytes, complement factors, and natural killer cells. Generally, support by the third line of defence is needed, i.e. the socalled specific irrunune system.

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Stichting Dr. Ir. J.H.J. van de Laar
J.J.M. van Dongen (Jacques)
Erasmus University Rotterdam
hdl.handle.net/1765/21411
Erasmus MC: University Medical Center Rotterdam

Verschuren, M. (1996, December 4). T cell receptor-o deletion in human T cells. Retrieved from http://hdl.handle.net/1765/21411