T-4 cell

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T-4 cell,

a thymus-derived lymphocyte of the body's immune system that activates the humoral immune system (B cells) and destroys or neutralizes cells or substances identified as "nonself." T-4 cells secrete a substance, interleukin-2, which stimulates the activity of natural killer cells, gamma interferon, and suppressor T-8 cells. The human immunodeficiency virus commonly targets T-4 cells, with the result that the body's immune defenses are severely damaged and opportunistic infections are allowed to flourish.

T-4 cell,

n a thymus-derived lymphocyte of the body's immune system with a role of destroying or neutralizing cells or substances identified as “nonself.” The human immunodeficiency virus (HIV) commonly targets the T-4 cells, with the result that the body's immune defenses are severely damaged and opportunistic infections are allowed to flourish.

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