Examlex
Nonresponse bias occurs when those responding to a survey or poll differ systematically from the nonrespondents.
Parasites
Organisms that live on or inside another organism (the host) and benefit at the host's expense, often causing harm.
Antigens
Substances, usually proteins, on the surface of bacteria, viruses, and other foreign substances, that trigger an immune response in the body.
Allergens
Substances that cause allergic reactions by triggering an immune response in susceptible individuals.
Lymphocytes
White blood cells that circulate through the lymph system and bloodstream, helping the body identify and destroy antigens and cancer cells.
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