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Lymphocytes

Edexcel A-level BiologyResponse to InfectionLesson 5 of 20

Lymphocytes are the white blood cells responsible for the specific immune response. Unlike phagocytes, each lymphocyte responds to only one antigen. They are small cells with a large nucleus that fills most of the cell.

All lymphocytes are made from stem cells in the bone marrow. They then mature in one of two places:
• B lymphocytes (B cells) mature in the bone marrow
• T lymphocytes (T cells) move to the thymus and mature there.

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