Cryosections of human fibrotic liver were (immuno)histochemically stained (1) to show staining of hPDGFRβ with SP02SP26-ethyl next to staining with a commercially available anti-PDGFRβ IgG antibody and of other fibrosis markers, and (2) to show staining of hPDGFRβ at different stages of liver fibrosis. The gene discussed is PDGFRB; the disease is Hepatic fibrosis.