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<p>TH<sub>0</sub> populations are CD4<sup>+</sup> cells that have yet to differentiate into TH<sub>1</sub>, TH<sub>2</sub> or TH<sub>17</sub> cells and they secrete IL-2, IL-4, IL-5, IFN-γ. In the presence of IL-4 they develop into TH<sub>2</sub> cells while in the presence of IL-2 they develop into TH<sub>1</sub> cells. In the abscence of IL-2 TH<sub>1</sub> cells will change into TH<sub>2</sub> cells. TH<sub>17</sub> cells develop in the presence of TGF-β and IL-6 and can further develop into TH<sub>1</sub> cells depending on various conditions. </p>
 
<p>TH<sub>0</sub> populations are CD4<sup>+</sup> cells that have yet to differentiate into TH<sub>1</sub>, TH<sub>2</sub> or TH<sub>17</sub> cells and they secrete IL-2, IL-4, IL-5, IFN-γ. In the presence of IL-4 they develop into TH<sub>2</sub> cells while in the presence of IL-2 they develop into TH<sub>1</sub> cells. In the abscence of IL-2 TH<sub>1</sub> cells will change into TH<sub>2</sub> cells. TH<sub>17</sub> cells develop in the presence of TGF-β and IL-6 and can further develop into TH<sub>1</sub> cells depending on various conditions. </p>
 
<p>TH<sub>1</sub> cells have two populations; one that secretes IFN-γ and is short lived, and the other that doesn’t secrete IFN-γ and is long lived. The cells that do not secrete IFN-γ are termed '''memory T cells'''</p>
 
<p>TH<sub>1</sub> cells have two populations; one that secretes IFN-γ and is short lived, and the other that doesn’t secrete IFN-γ and is long lived. The cells that do not secrete IFN-γ are termed '''memory T cells'''</p>
<p> T cell differentiation is a field of continual change, with many discoveries made on a regular basis. </p>
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<p> T cell differentiation is a field of continual change, with discoveries made on a regular basis. </p>
    
==Cytotoxic CD8<sup>+</sup>==
 
==Cytotoxic CD8<sup>+</sup>==
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