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Delayed asthmatic response (DYAR) to allergen challenge and phosphate-buffered saline (PBS) control challenge. The mean percentage changes in the forced expiratory volume in 1 secibd (FEV1) values calculated from 17 DYARs and 17 PBS control challenges. ●, the initial DYAR; ○, the repeated DYAR; *, the initial PBS; +, the repeated PBS; I, initial (baseline) values; ALL, allergen challenge; bars, means ± SEM.
