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A, Total number of CD69+/CD4+ T cells after coculture with HNECs. B, IL-13 level after 48 hours of coculture. C, Fraction of CD69+/CD4+ T cells in coculture without and with birch pollen–stimulated T cells, ruling out that the T-cell activation was mediated by MHC class II–expressing T cells. *P < .05.
