Figure Box 1.
—Illustration of the different fates and steps in the retrogene “life cycle” that can be compared to make evolutionary inferences. See text for more details.
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.