Examlex
Which of the following is considered an external audience of a public relations activity?
Antibody
Protein found in the plasma that is responsible for humoral immunity; binds specifically to antigen.
T Cell
A type of lymphocyte that plays a central role in cell-mediated immunity, capable of directly killing infected host cells or activating other immune cells.
B Cell
A type of white blood cell that plays a significant role in the immune response by producing antibodies.
Positive Selection
A process in the immune system where developing T-cells are selected for their ability to recognize and bind to self-MHC molecules, crucial for immune response.
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