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.
A tree illustrating the counting of the numbers of observed and expected molecular convergences between two thick branches. For a given position, the amino acids at nodes 0–4 are indicated by X0–X4, respectively. The relevant branch lengths are indicated by the b values.
