AECII, Alveolar type II epithelial cells; HFL, Human fetal lung; PTEN, Phosphatase and tensin homolog; RDS, Respiratory distress syndrome; SP, Surfactant proteins; TGF- β, Transforming growth factor-beta; VAMP2, Vesicle-associated membrane protein 2; ZEB1/2, Zinc finger E-box-binding homeobox...