The real importance of the immune system is evident when it does not function well. Nowadays perhaps the most well-known immune defect is the acquired immunodeficiency syndrome (AIDS). This disease made it clear to the public that we are permanently surrounded by pathogens like bacteria, protozoa, fungi, and viruses. All of these infectious agents are challenging the body and when they are not stopped, these particles will invade and make us ill.
KeywordsNatural Killer Natural Killer Cell Gene Segment Classical Pathway Membrane Attack Complex
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