Epithelial progenitor cell of the lung. Club cells are dome-shaped with short microvilli but no cilia. They function to protect the bronchiolar epithelium. Club cells also multiply and differentiate into ciliated cells to regenerate the bronchiolar epithelium. [ http://dx.doi.org/10.1183/09031936.00146609 http://www.ncbi.nlm.nih.gov/pubmed/7905712 http://www.ncbi.nlm.nih.gov/pubmed/28128362 ]