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T-helper 1 serum cytokine levels in NGT, DM and DN subjects: (A) Interleukin (IL)-12, (B) Interferon-g (IFN-g) and (C) IL-2. The geometric mean is represented by the horizontal bars. P values were calculated by Kruskal-Wallis one-way analysis of variance. P < 0.05 was considered significant.
