TGFB3 and idiopathic pulmonary fibrosis: Consistent with TGF‐β being a master regulator of fibrosis (Akhurst & Hata, 2012), BLEO‐IPF mice demonstrated substantially increased TGFβ levels in both BALF (TGFβ1, TGFβ2, TGFβ3) and lung tissue (TGFβ2, TGFβ3) for up to 28 days after BLEO administration.