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.
Maximal likelihood tree of the ppp elements, obtained from 1000 bootstrap replicates, using the HKY model (42). The tree was computed with phylowin (43), after manual inspection of the multiple alignment of the complete elements. Gaps were excluded. The families are indicated at the origin of the branches that separate them from the remaining elements. All bootstrap values better than 50% are shown. We obtained a tree with a similar topology using maximum parsimony (data not shown).
