THE IMMUNE SYSTEM IS A HOST DEFENSE SYSTEM COMPRISING MANY BIOLOGICAL STRUCTURES AND PROCESSES WITHIN AN ORGANISM THAT PROTECTS AGAINST DISEASE. TO FUNCTION PROPERLY, AN IMMUNE SYSTEM MUST DETECT A WIDE VARIETY OF AGENTS, KNOWN AS PATHOGENS, FROM VIRUSES TO PARASITIC WORMS, AND DISTINGUISH THEM FROM THE ORGANISM’S OWN HEALTHY TISSUE.
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