The present invention provides: a marker composition for diagnosing asthma, comprising a detection reagent for Claudin-4 (CLDN4); a kit for diagnosing asthma, comprising the same; a data providing method for diagnosing asthma; and a screening method of asthma treatment or a preventive active substance. The present invention is useful in diagnosing asthma.;COPYRIGHT KIPO 2017
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