In contrast to progressive increases in PSR staining and maintained overexpression of Col3, levels of Col1a1 and α‐SMA [marker for collagen‐producing cells of myofibroblast lineage (Wollin et al., 2015)] declined after reaching a maximum on day 14 in BLEO IPF mice. The gene discussed is ACTA1; the disease is idiopathic pulmonary fibrosis.