Woese divided the prokaryotes (previously classified as the Kingdom Monera) into two groups, called Eubacteria and Archaebacteria, stressing that there was as much genetic difference between these two groups as between either of them and all eukaryotes.
Woese delade prokaryoterna (tidigare klassificerade som riket Monera) i två grupper som han kallade Eubacteria och Archaebacteria eller Archea och betonade härigenom att det var lika stor skillnad mellan dessa två grupper som mellan dem och alla eukaryoter.