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.
Reactions colored according to the most distant species from Homo sapiens in which the reaction could be inferred. Warmer colors indicate reactions found in distantly related species; cooler colors indicate reactions inferred only in closely related species.
