Any of the T cells that carry the CD4 glycoprotein receptor on their surface and that when stimulated by foreign antigens release lymphokines that promote the activation and function of B cells and killer T cells.
A type of T cell that helps coordinate the immune response, especially by activating B cells: the AIDS virus targets and destroys these T cells.
Any of a class of T cells that are activated by interacting with antigen-presenting cells, such as dendritic cells, and then function to activate other cells of the immune system, including B cells, cytotoxic T lymphocytes, and phagocytes. Activated helper T cells usually have CD4 receptors on the surface.
Any of various T cells that, when stimulated by a specific antigen, release lymphokines that promote the activation and function of B cells and killer T cells.