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.
Prefixes as in legend to Figure 2. For display, trees have been rooted by bisecting the longest internal branch. Topology support for selected nodes is indicated (Bayesian partial bootstraps/ML/NJ/MP). Bootstrap values for all nodes under all four methods are given in Files S4 and S5.
