In particular, the observation that low frequency stimulation (20 Hz) over the lung base (where fibrosis is usually most extensive in IPF) induces a C2 cough response in more patients than at other sites is consistent with the hypothesis that distortion of lung architecture contributes to the pathogenesis of cough in IPF, possibly by a mechanism involving rapidly adapting receptors (RARs). The gene discussed is RARS1; the disease is fibrosis.