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.
Four different shades of red indicate level of inhibition, and two shades of green indicate level of enhancement, with the most intense colors corresponding to the highest inhibition or enhancement, respectively. White indicates no activity. N/D, not determined.
