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Correlations between Th2, Th1 and Tr1-like cell populations in (a) non-allergic and (b) birch-allergic individuals. Data represents the background-corrected frequency of CD154+IL-4+ Th2 cells, CD154+IFNγ+ Th1 cells and CD154+IL-10+ Tr1-like cells per 106 CD4 T cells.
