T cells acts as a workhorse for the adaptive immune system, with the job of orchestrating defences against microbial invasion. A subcategory of T cells, T helper cells, defends against microbes, also causes trouble by inducing inflammation in immune-mediated diseases. T helper cells become further specialized, or differentiated, and a type known as TH17 has recently stepped into the limelight. These cells produce a messenger molecule called IL-17 (Interleukin-17), and are notable both in providing defence against extracellular b...
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