Two canine hepatic homegrafts: A, left, 120 days after transplantation (dog 5 group 1). A band of reticulin fibers links 2 central veins. Reticulin, × 65. B, right, 52 days after transplantation (dog 18 group 2). Centrizonal liver cell necrosis and hemorrhage is combined with cellular infiltration of the portal tracts (P). Compare with Figure 6A. Hematoxylin and eosin, × 65.