Figure 1: Enzymatic Peroxidase immunochemical staining for CD271 expression in frozen sections from human fetal and adult livers and fetal liver cells (FLCs). Isotype controls were included. DAB (in fetal and adult liver sections) and AEC (in FLCs) substrates were used for color development. Brown color indicates positive staining. Some hepatoblasts (H) stained positive for CD271. In the adult liver, CD271 was mainly expressed in the portal area (P). Magnification 20X.