In this regard, we found relatively unique and specific expression of PLA2G2A in a subset of fibroblast (PLA2G2A+ IPF fibroblast) that is very specific to IPF (Figure 2A–D) and also validated the same in two different single cell-RNA seq data sets (Figure 3A–E and Figure 4A–E). This evidence concerns the gene PLA2G2A and idiopathic pulmonary fibrosis.