TGFB1 and asthma: As TGFB1I1 was originally identified as a TGF-β1-inducible gene, and its induction by TGF-β1 has been observed in multiple cell types15, we tested whether it is similarly induced by TGF-β1 in HBE cells, given that TGF-β1 levels are elevated in patients with asthma.