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''Still under investigation''
 
''Still under investigation''
 
<br />
 
<br />
The T<sub>H</sub>17 cells which form when T<sub>H</sub>0 cells are challenged with IL-6 and TGF-β produce a number of cytokines that enhance the innate immune response. The [[Cytokines|cytokines]] produced enhance the extravasation and chemotaxis of [[Neutrophils|neutrophils]] to the site of infection, in the aim of combating extracellular bacteria. These cytokines include:
+
The T<sub>H</sub>17 cells form when T<sub>H</sub>0 cells are challenged with IL-6 and TGF-β to produce a number of cytokines that enhance the innate immune response <ref>{{citation|initiallast = Metcalfe|initialfirst = T|2last = Korn|2first = D|finallast = Kuchroo|finalfirst = V.K.|year = 2009|jtitle = IL-17 and Th17 Cells
 +
|jor = Annual Reviews of Immunology|vol = 27|range = 485-517}}</ref>. . The [[Cytokines|cytokines]] produced enhance the extravasation and chemotaxis of [[Neutrophils|neutrophils]] to the site of infection, in the aim of combating extracellular bacteria. These cytokines include:
 
*IL-17
 
*IL-17
 
*IL-17F
 
*IL-17F
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