Clarifying the Role of TH-17 Cells in Disease and Health

In investigating the complex workings of the immune system, researchers are learning more about a recently discovered group of T helper cells--TH-17 cells, so designated because they produce interleukin 17 in response to infection and other challenges to the immune system, along with being implicated in certain autoimmune diseases. Recent Hot Papers clarify the processes by which TH-17 cells are triggered, differentiated, and assigned to different defensive roles.
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