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Cytokine expression profiles of the three classes of regulatory T cells
| Cytokine expressed | Th3 cells | T regulatory 1 cells | CD4+CD25+ TR cells |
| Interferon gamma | +/- | + | - |
| IL-4 | +/- | - | - |
| Transforming growth factor beta | +++ | ++ | +/- |
| IL-10 | +/- | +++ | +/- |
The production of cytokine is indicated as absent (-) or present (+) with relative quantities of cytokine indicated by +/- < + < ++ < +++.
