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.
Multiple arrows represent increased transcription; P; phosphorylated protein; dotted and full arrowed lines represent potential and defined signaling cascades respectively. See text for details.
