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Increased expression of COL1A1 in AMs from fibrotic ILDs. (A) Typical images of BAL cytospins stained with anti-human COL1A1 and ToPro-633 nuclear stain from (i) healthy, (ii) IPF, and (iii) a representative N-IPF (RA-ILD) sample. Arrows indicate prominent COL1A1 expression in BAL cells. (B) Violin plots of mean log COL1A1 expression/cell per group. (Brown-Forsythe Anova, with pairwise comparisons, ****p < 0.0001).
