COL3A1 and idiopathic pulmonary fibrosis: Interestingly, 68–93% of the cells on this cluster that had low expression of myofibroblast-associated genes also had high expression levels of IPF-associated profibrotic markers such as MFAP4, LTBP1, BGN, COMP, MMP2, COL3A1 and COL8A1.