Group A: CD4+ T lymphocytes; Group B: CD4+ T lymphocytes and thy0517 cells coculture; Group C: CD4+ T lymphocytes and thy0517 cells coculture and 10 μ g / ml PHA were added; Group D: CD4+ T lymphocytes and thy0517 cells coculture and 20 μ g / ml PHA were added

*There was statistical significance between groups; The percentage difference of Th17 in each group was statistical significance; The percentage difference of Tregs between group A, C and D was no statistical significance.