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Teff production of IFN-γ and TNF-α and inhibition by Treg in HS and PD patients. Teff were stimulated with PHA alone (white columns) or in the presence of Treg 1:1 (hatched columns). Data are means ± SD of n = 6–10 subjects. *P < 0.05 and **P < 0.01 vs Teff alone; #P < 0.01 vs HS
