A non-mucous, epithelial secretory cell that is part of the tracheobronchial tree. A club cell has short microvilli but no cilia. A club cell is able to multiply and differentiate into ciliated cells to regenerate the bronchiolar epithelium and it also protects the tracheobronchial epithelium. [ http://dx.doi.org/10.1183/09031936.00146609 http://www.ncbi.nlm.nih.gov/pubmed/29874100 http://www.ncbi.nlm.nih.gov/pubmed/28128362 http://dx.doi.org/10.1378/chest.12-2762 http://www.ncbi.nlm.nih.gov/pubmed/7905712 GOC:tfm ]