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.
In an in vitro model of the blood–brain barrier, endothelial cells pack tightly together, with their nuclei (blue) surrounded by a key tight junction protein known as claudin-5 (green). Image courtesy of Eric Shusta and Tongcheng Qian (University of Wisconsin–Madison, Madison, WI).
