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T lymphocytes
Cell mediated immunity. Directly attack foreign cells, coordinate the immune response, active against parasites, viruses, fungi, intracellular bacteria, cancer cells. Cells with no self
B cells
Activate when they recognize an antigen, divided into 2 cells types.
1. Memory cells- store information for future immune responses
2. Plasma cells- actively secrete antibodies which bind to atigen
Classes of antibodies
IgG: most prevalent in blood
IgM: first antibody produced in an immune response
IgA: found in secretions including breast milk
IgD: function is unclear
IgE: plays a key role in allergic responses
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