Figure 1

Histological appearance of an initial CRC tissue specimen (a) and two xenografts derived from the same specimen and resected 10 (b) and 30 (c) days after implantation. H&E; original magnification, × 100. Presence of erythrocytes in the lumen of blood vessels in an initial tissue specimen (d) and xenografts harvested 10 (e) and 30 (f) days postimplantation. H&E; original magnification, × 400.