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.
Color and direction of arrows indicate direction of regulation change. Green arrows = downregulation, red arrows = upregulation. Line graphs represent lenticular GSH content which decreases from top to bottom of the figure.
