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Features of weather include all of the following except
Antigens
Substances that the immune system recognizes as foreign, triggering an immune response; often parts of pathogens like bacteria, viruses, or fungi.
Toxins
Poisonous substances produced by living cells or organisms that can cause disease when introduced into the body tissues.
Complement System
A part of the immune system that enhances (complements) the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism.
Clonal Selection
Lymphocyte activation in which a specific antigen causes activation, cell division, and differentiation only in cells that express receptors with
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