COL1A1 and idiopathic pulmonary fibrosis: The analysis of the differentially expressed genes in LIF vs MYF subclusters in the two LF-IPF vehicle-treated samples indicated a strong correlation between these subpopulations within the two samples (Figure 3B-C) and revealed, in addition to PLIN2 the presence of GDF15 as well as several metallothioneins (MT1A, MT1E, MT1G, MT1X, MT2A) in the LIF subpopulation (cluster 2) while genes coding for several collagens (COL1A1, COL1A2, COL3A1, COL5A2, COL6A3) were enriched in the MYF population (cluster 0) (Figure 3C).