Biology / Bio 3271 · Atom · ~20 seconds
Natural Killer Cells
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Natural killer cells patrol for infected or cancerous cells lacking normal surface markers and destroy them directly, an innate defense needing no prior exposure to a pathogen.
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A cell that stops displaying its usual surface markers becomes a target for natural killer cell destruction.
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Natural killer cells act without pathogen-specific memory, unlike the adaptive lymphocytes this chapter covers next.