Apoptosis of bronchial epithelial cells in post-race samples Apoptosis of bronchial epithelial cells in post-race samples. a) Airway cell composition (Diff-Quick staining) and apoptosis (TdT-mediated dUTP nick end labelling (TUNEL)) of airway cells in induced sputum at baseline and after a half-marathon race. b) A la... Apoptosis of bronchial epithelial cells in post-race samples. a) Airway cell composition (Diff-Quick staining) and apoptosis (TdT-mediated dUTP nick end labelling (TUNEL)) of airway cells in induced sputum at baseline and after a half-marathon race. b) A large proportion of bronchial epithelial cells were apoptotic in post-race samples. Oct, May and Nov refer to three different half-marathon races during which samples were collected. **: p<0.01. Reproduced from [15] with permission. Giuseppe Morici et al. Breathe 2016;12:140-147 ©2016 by European Respiratory Society