Cells of the Immune System- Responsible for specificity of immune reaction; activated by specific antigens to produce antibodies, cytokines (CD4 T cells), or direct cytotoxicity (CD8 T cells)
- Lymphocytes: natural killer (NK) cells, B cells, and T cells
- Monocytes: macrophages and dendritic (Langerhans) cells
- Granulocytes: neutrophils, eosinophils, and mast cells
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