Asthmatic Airway Cells include lung fibroblasts, bronchial epithelial and bronchial smooth muscle cells. Lung fibroblasts are isolated from adult lung tissue, bronchial epithelial cells are isolated from epithelial lining of airways above bifurcation of the lungs, bronchial smooth muscle cells are isolated from the major bronchia. Product Link: http://www.creative-bioarray.com/Diseased-Asthma-Small-Airway-Epithelial-Cells-CSC-C8074L-item-40384.htm