Nasal cytokine concentrations after allergen challenge with and without pretreatment with fexofenadine. After the nasal allergen challenges, nasal secretions were collected with filter paper strips placed on the inferior turbinate at baseline and at 2, 4, and 6 hours. Cytokines were eluted from the filter paper and concentrations determined by ELISA. Data represent baseline and peak cytokine concentrations. Figure 2a: GM-CSF, 2b: IL-10, 2c: IL-4, 2d: MIP-1α, 2e: TNF-α.