Since Col4a1 and Col4a2 not yet related to pulmonary fibrosis according to the text mining analysis (Figure 6B) were highly interconnected with bleomycin-induced fibrosis regulome and upregulated in asthmatic and asthma-driven fibrotic lungs (Figure 6C), their expression along with the expression of Col1a1 were further verified on the protein level using IHC staining. Here, COL4A1 is linked to pulmonary fibrosis.