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Proc Natl Acad Sci U S A. 1977 Nov; 74(11): 5088–5090.
PMCID: PMC432104
PMID: 270744

Phylogenetic structure of the prokaryotic domain: the primary kingdoms.


A phylogenetic analysis based upon ribosomal RNA sequence characterization reveals that living systems represent one of three aboriginal lines of descent: (i) the eubacteria, comprising all typical bacteria; (ii) the archaebacteria, containing methanogenic bacteria; and (iii) the urkaryotes, now represented in the cytoplasmic component of eukaryotic cells.

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