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.
Solid lines, regulatory links observed in our experiments; dashed lines, possible regulatory links observed in other studies. Arrows indicate positive regulation; blunt ended bars indicate inhibition.
