Photomicrographs of liver sections illustrating a normal portal tract (A) and a portal tract from a dog with a postnecrotic healing response (B) with a considerable ductular reaction (arrows). A—The limiting plate is marked with a dashed line. B—The limiting plate is disrupted and cannot be ascertained due to the considerable ductular reaction. PV = portal vein. A = artery. BD = bile duct. H&E stain.