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Having recognised the invader, different types of T-cell then have different jobs to do. Some send chemical instructions (cytokines) to the rest of the immune system. Your body can then produce the most effective weapons against the invaders, which may be bacteria, viruses or parasites. Other types of T-cells recognise and kill virus-infected cells directly. Some help B-cells to make antibodies, which circulate and bind to antigens.

A T-cell (orange) killing a cancer cell (mauve).
A T-cell (orange) killing a cancer cell (mauve).
Dr Andrejs Liepins/Science Photo Library

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