Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Gross appearance of Ud xenograft tumors at 24 days after transplantation, which was transplanted repeatedly 20 times. The xenograft tumor was solid, dark red in color, and contained necrotic and blood-filled areas on the cut surface. Bar: 2.5 mm.
