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. Here, TGFB1 is linked to idiopathic pulmonary fibrosis.