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Definitions:
Noun
helper T cell
helper cell
CD4 T cell
CD4 cell
Definition: T cell with CD4 receptor that recognizes antigens on the surface of a virus-infected cell and secretes lymphokines that stimulate B cells and killer T cells; helper T cells are infected and killed by the AIDS virus
Definition: A subtype of T cell that helps the activity of other immune cells by releasing cytokines, playing an important role in the adaptive immune system.