“They conjecture that an evolutionary quantum leap happened after an archaebacterium swallowed a eubacterium.”

“Healthy people's feces were rich in Eubacterium, Roseburia and Bacteroides species.”

“Eubacterium, plural eubacteria, also called bacteria, term formerly used to describe and differentiate any of a group of prokaryotic true bacteria from the archaebacteria.”

“All protein sequences from 21 complete chloroplast genomes are analyzed in comparison with selected archaea, eubacteria, and eukaryotes.”

“Chlamydiae are Gram-negative eubacteria that replicate strictly inside eukaryotic cells.”

“The most startling such event was the origin of the eukaryotes by the fusion of an archaebacterium with some eubacteria.”