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Explain pheromones and theorize why they are not significantly employed by humans.
Lymphocytes
A type of white blood cell that is part of the immune system, playing a significant role in the body's defense mechanisms against pathogens.
Fungi
A kingdom of spore-producing organisms feeding on organic matter, including molds, yeast, mushrooms, and toadstools.
Antigens
Substances that the immune system recognizes as foreign, triggering an immune response.
Allergens
Substances that can cause an allergic reaction in some individuals.
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