| 单词 | helper T cell | 
| 释义 | helper T cell n.  Any of a class of T cells that are activated by interacting with antigen-presenting cells, such as a 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. Also called  T-helper cell. | 
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