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.
Numbers refer to branch support (Bayesian posterior probability) for the internal branches adjacent to the nodes. Sea urchin Runt genes were used to root the tree. Branch length reflects the number of substitutions per alignment site (compare scale bar).
