Creative Bioarray's normal Human Bronchial/Tracheal Epithelial Cells, when grown in Creative Bioarray's LIBro Medium, provide an ideal serum-free culture model for the accurate studies of toxicity, cystic fibrosis, asthma, pathogenesis, pharmacology or airway wound healing. Creative Bioarray's HBTEC are cultured without retinoic acid and cryopreserved as primary cells to ensure the highest viability and plating efficiency. Our HBTEC are quality tested in LIBro B/T Medium to ensure optimal growth over a period of at least 15 population doublings at rates equal to or greater than other commercially available media. Cell Features: HBTEC are cryopreserved as primary cells. Cells are isolated from human bronchi/trachea and expanded once in culture vessels before being harvested for cryopreservation. HSAEC are cryopreserved after primary cells are isolated from human lung tissue and expanded once in culture vessels before being harvested for cryopreservation. Creative Bioarray's Human Airway Epithelial Cells are not exposed to retinoic acid during isolation or expansion. Human Airway Epithelial Cells are extensively tested for quality and optimal performance. Creative Bioarray guarantees performance and quality.