An official website of the United States government
Here's how you know
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.
Photomicrograph illustration showing Ki-67 (a proliferation marker) immunostaining in actively dividing osteosarcoma cells in tibia (A), lungs (B) and kidneys (c). Arrows indicate mitotic figures where Ki-67 is maximal.