Cell Membrane - A semipermeable barrier that separates the interior of a cell from the external environment.⏎
Autoimmune Disease - An umbrella term for a range of conditions in which the immune system mistakenly attacks healthy tissue in the body.⏎
Biological Agent (Terrorism) - A bacterium, virus, or other biological toxin used in bioterrorism or biological warfare.⏎
Chronic Disease - Any disease that is long lasting (3 months or more) or recurrent—as opposed to an acute disease—and cannot be prevented by a vaccine or cured by medication.⏎