Towards a natural system of organisms: proposal for the domains Archaea, Bacteria, and Eucarya. Proc Natl Acad Sci U S A 87, 4576–4579 (1990). Woese, C. R. & Fox, G. E. Phylogenetic structure of ...

Leão and his team used a database of prokaryotic defense systems to study the distribution of complete systems in the genomes of archaea, including Asgard archaea, and bacteria. 7 The researchers ...