Kategorie B - Liegt zur Lizenzierung ohne Wasserzeichen in folgendem Format vor: 720x576.
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English: Category B -
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Text: A phagocyte at work. She has been alarmed by the immune system, a foreign object, a socalled antigen has invaded. The phagocyte has already detected this antigen and gorges it. After that the phagocyte presents parts of the antigen on its surface. Fitting T-helper-cells are docking. The type of t-helper-cell gives information to the immune system about the kind of invader. The T-helper-cell in turn activates B-cells. These B-cells create plasma-cells which are producing antibodies which destroy the foreign invader.
