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.
Calibration scheme used for the phylogeny of proteins of archaeal origin. Topology follows literature consensus.
| Calibration (topology follows literature consensus) | Older boundary (bya) | Younger boundary (bya) | Number of studies |
|---|---|---|---|
| Last Universal Common Ancestor (LUCA) | 4.30 | 4.19 | 3 |
| Proteobacteria + Campylobacter (older) | 2.97 | 2.78 | 2 |
| Metazoa crown (younger) | 1.31 | 0.87 | 10 |
