Finally, the three-domain structure of Woese's tree (Figure 1a) shows that evolutionary history is decoupled from biological organization. Indeed, archaea and bacteria appear very similar ...

The protocol consisted of digestion and two-dimensional electrophoresis of radioactive small-subunit (16S or 18S) ribosomal RNA. When exposed to X-ray film, the separated fragments generated a unique ...

This groundbreaking effort involved analyzing over 1,000 genetic samples of microbes, primarily bacteria and archaea (another domain of life once considered to be bacteria), collected from 50 ...

In the three-domain model, eukaryotes belong to a separate branch that shares a common ancestor with archaea. But phylogenetic analyses suggest that complex cells emerged from within the archaea. This ...

On one side there are the tiny bacteria and archaea, collectively known as prokaryotes. On the other side there are the huge and unwieldy eukaryotes, the third great domain of life. A typical ...