CGA and idiopathic pulmonary fibrosis: Further, IHC analysis for CgA protein in normal and IPF lung tissues showed that this protein is rarely detected in normal lungs (Fig. 6e) but CgA-positive cells were detected in slow-IPF, rapid-IPF lung biopsies (Fig. 6f-g), and most abundant in end stage lung-explants (Fig. 6h-i).