PLIN2 and idiopathic pulmonary fibrosis: IPF fibroblast foci region is enriched with multiple mesenchymal cell types like fibroblasts, PLIN2+ fibroblasts and myofibroblasts, while IPF immune infiltrate region is enriched exclusively with diverse immune cell types including B cells, T cells, NK cells, monocytes, and macrophages (Figure 1D).