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What are the ultimate sources of all of Earthʹs energy?
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.
Antigens
Substances that the immune system recognizes as foreign or dangerous, leading to an immune response.
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