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The fastest growing group of Internet users is older people 70+).
Antigens
Substances that are recognized by the immune system and can elicit an immune response, often foreign proteins or polysaccharides found on pathogens.
Perforin
A protein secreted by natural killer cells and cytotoxic T lymphocytes to kill cells by forming pores in their membranes.
Alpha Interferon
A type of protein produced by the body's immune system, used in the treatment of various infections and diseases, including some types of cancer.
Lymphotoxin
A cytokine produced by certain lymphocytes that can induce cell death and has a role in immune response.
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