Abbreviations
ALI: Air-liquid interface
ACT: Asthma control test
CRTH2: Chemoattractant receptor-homologous molecule expressed on Th2 cells
HBEC: Human bronchial epithelial cell
PEFR: Peak expiratory flow rate
PGD2: Prostaglandin D2
TER: Transepithelial electrical resistance
Th2: T helper 2 cells
TJ: Tight junction
Tregs: Regulatory T cells
tSNE:  t-Distributed stochastic neighbor embedding