BLT1⁺ memory T cells traffic into the airways of asymptomatic atopic asthmatics. (A) Representative example of freshly isolated blood and bronchoalveolar lavage (BAL) total lymphocyte BLT1 expression in one study subject. (B) Representative phenotypic characterization of blood, BAL, and BLT1⁺ blood and BAL lymphocytes in a study subject. (C) BLT1⁺ memory T cells are enriched in the BAL compared with blood in 5 atopic asymptomatic study subjects. Symbols represent individual study subjects.