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Which neurotransmitter is secreted by a cholinergic fiber?
Clonal Selection Theory
A theory in immunology that explains how the immune system responds to specific antigens by activating the clone of cells that can recognize and attack the invader.
Antigen
Foreign substance, usually a protein or a polysaccharide, that stimulates the immune system to react, such as to produce antibodies.
T Cells
A type of white blood cell that plays a critical role in the immune system, especially in the adaptive immune response, by identifying and killing infected cells or orchestrating the immune response.
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