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.
Doubling time of medulloblastoma and glioma cells grown as monolayer cultures in the presence of human embryonic kidney or Slit2 beads after 4 or 6 days