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Clinical features of asthma are present in patients with Th2-high and Th2-low asthma. (A) FEV1, a measure of airway obstruction. (B) Improvement in FEV1 after four puffs (360 μg) of albuterol (bronchodilator reversibility testing). (C) Provocative concentration of methacholine required to induce a 20% decline in FEV1 (PC20), a measure of airway hyperresponsiveness.
