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How do natural killer cells differ from B cells and T cells?
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white blood cell
Blood is made up of multiple components, including red blood cells, white blood cells, platelets, and water-rich plasma.
Natural killer (NK) cells differ from B cells and T cells primarily in their role within the immune system and their method of target recognition.
Innate vs. Acquired Immunity
- Natural Killer Cells: These are components of the innate immune system. They provide a rapid, nonspecific defense by destroying the body's own cells that have become cancerous or infected with a virus. They do not require prior exposure to a target cell to function.123
- B and T Cells: These are lymphocytes responsible for acquired immunity. They provide a targeted, specific response to antigens and possess the ability to form memory cells, which allow for a faster and more effective response upon reinfection.42
Mechanisms of Action
- NK Cells: They recognize dividing or abnormal cells without needing specific antigen presentation. Upon binding, they release cytotoxic granules that cause the target cell to die.13
- B Cells: They participate in humoral immunity by differentiating into plasma cells that secrete antibodies to neutralize pathogens.45
- T Cells: They engage in cell-mediated immunity. Cytotoxic T cells directly destroy infected cells, while helper T cells coordinate the immune response by activating B cells and other immune cells.45