The origins of life on Earth have long fascinated scientists, particularly the nature of the last universal common ancestor ...

Indeed, archaea and bacteria appear very similar ... of diverse life-forms to construct and compare thousands of phylogenetic trees for individual genes. Unexpectedly, when comparing these trees ...

Scientists propose that the eukaryotic branch of this family tree formed when two prokaryotes ... Leão and his team used a database of prokaryotic defense systems to study the distribution of complete ...

(A) The unrooted three-domain tree derived by phylogenetic analysis of 16S rRNA and other information-processing genes. (B) The rooted three-domain tree. (C) The network of life. A: archaea; B ...