Most of the genes differentially altered in D1+ TGF-β vs D1 (6/1030–35) and D20+ TGF-β vs D20 (7/1036–38,40) have been described previously, while half of those altered in D20+ TGF-β vs D1+ TGF-β32,38,39 and only 2 in D20 vs D1 comparison41,42 had been previously described in asthma, airway remodelling or airway inflammation. This evidence concerns the gene TGFB1 and asthma.