IB3-1 (deltaF508/W1282X) bronchial epithelial cells were cultured in T75 flasks with gentamicin-free LHC-8 medium. After reaching 80% confluence cells were treated with 1 mM PBA for 24 hr. A T75 flask of confluent IB3-1 cells was rinsed twice with ice cold Hank’s buffer then scraped into 3ml of ice cold TRIzol (Gibco BRL) then rinsed with 3 ml ice cold TRIzol and the mRNA was isolated according to the TRIzol protocol. Array images were assessed by eye to confirm scanner alignment and the absence of significant bubbles or scratches. Chip scanning and expression analysis was performed using Microarray Analysis Suite 5.0 software and scaled to an average probe set intensity of 150.