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TH<sub>1</sub> cells secrete a range of cytokines, including:
 
TH<sub>1</sub> cells secrete a range of cytokines, including:
* '''IL-2''', which induces proliferation of both [[Helper_CD4%2B#Helper_CD4.2B|CD4+]] and [[Cytotoxic CD8+|CD8+ T-cells]]. This stimulation of T cell proliferation is the main function of the TH<sub>1</sub> cell.
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* '''IL-2''', which induces proliferation of both [[Helper_CD4%2B#Helper_CD4.2B|CD4+]] and [[Cytotoxic_CD8%2B#Cytotoxic_CD8.2B|CD8+ T-cells]]. This stimulation of T cell proliferation is the main function of the TH<sub>1</sub> cell.
 
* '''Interferon gamma''' ('''IFN&gamma;''') which activates tissue macrophages and is the principal effector mechanism in the defence against intracellular bacteria and parasites such as  Mycobacteria, Brucella, Rickettsia Leishmania, Coccidia, and Babesia. Interferon gamma activates macrophages and stimulates them to produce enzymes triggering intracellular killing mechanisms - specifically:
 
* '''Interferon gamma''' ('''IFN&gamma;''') which activates tissue macrophages and is the principal effector mechanism in the defence against intracellular bacteria and parasites such as  Mycobacteria, Brucella, Rickettsia Leishmania, Coccidia, and Babesia. Interferon gamma activates macrophages and stimulates them to produce enzymes triggering intracellular killing mechanisms - specifically:
 
#Superoxide dismutase and myeloperoxidase that produce H<sub>2</sub>O<sub>2</sub> and trigger the "superoxide burst".
 
#Superoxide dismutase and myeloperoxidase that produce H<sub>2</sub>O<sub>2</sub> and trigger the "superoxide burst".
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