Cavalier-Smith, T. (1992) Bacteria and eukaryotes. Nature (London) 356, 570.

Cavalier-Smith, T. (1993) Kingdom Protozoa and its 18 phyla. Microbiol. Rev. 57, 953–994.

Chatton, E. (1937) Titres et Travauz Scientifiques (Setes, Sottano, Italy).

Cohen, A., Lam, W. C., Charlebois, R. L., Doolittle, W. F. & Schalkwyk, L. C. (1992) Localizing genes on the map of the genome of Haloferx volcanii, one of the archaea. Proc. Natl. Acad. Sci. USA 89, 1602–1606.


DeLong, E. F. (1992) Archaea in coastal marine environments. Proc. Natl. Acad. Sci. USA 89, 5685–5689.

Doolittle, W. F. (1991) The origins of introns. Curr. Biol. 1, 145–146.


Fitch, W. M. & Upper, K. (1987) The phylogeny of tRNA sequences provides evidence for ambiguity reduction in the origin of the genetic code. Cold Spring Harbor Symp. Quant. Biol. 52, 759–767.

Forterre, P., Benanchenhou-Lahfa, N., Canfalonieri, F., Duguet, M., Elie, C. & Labedan, B. (1993) The nature of the last universal ancestor and the root of the tree of life: still open questions. BioSystems 28, 15–32.

Fox, G. E., Magrum, L. J., Batch, W. E., Wolfe, R. S. & Woese, C. R. (1977) Classification of methanogenic bacteria by 16S ribosomal RNA characterization. Proc. Natl. Acad. Sci. USA 74, 4537–4541.


Gray, M. W. & Doolittle, W. F. (1982) Has the endosymbiont hypothesis been proven? Microbiol. Rev. 46, 1–42.


Hilario, E. & Gogarten, J. P. (1993) Horizontal transfer of ATPase genes—the tree of life becomes a net of life. BioSystems 31, 111–119.


Iwabe, N., Kuma, K., Hasegawa, M., Osawa, S. & Miyata, T. (1989) Evolutionary relationship of archaebacteria, eubacteria, and eukaryotes inferred from phylogenetic trees of duplicated genes. Proc. Natl. Acad. Sci. USA 86, 9355–9359.


Knoll, A. H. (1994) Proc. Natl. Acad. Sci. USA 91, 6743–6750.


Lam, W. C., Cohen, A., Tsouluhas, D. & Doolittle, W. F. (1990) Genes for tryptophan biosynthesis in the archaebacterium Haloferax (Halobacterium) volcanii. Proc. Natl. Acad. Sci. USA 87, 6614–6618.


Maizels, N. (1994) Proc. Natl. Acad. Sci. USA 91, 6729–6734.

Margulis, L. & Guerrero, R. (1991) Kingdoms in turmoil. New Sci. 129, 46–50.

Margulis, L. (1970) Origin of Eukaryotic Cells (Yale Univ. Press, New Haven, CT).

Mayr, E. (1990) A natural system of organisms. Nature (London) 348 , 491.

Meile, L., Stettler, R., Banholzer, R., Kotik, M. & Leisinger, T. (1991) Tryptophan gene cluster of Methanobacterium thermoautotrophicum Marburg: Molecular cloning and nucleotide sequence of a putative trpEGCBAD operon. J. Bacteriol. 173, 5017–5023.


Olsen, G. J., Woese, C. R. & Overbeek, R. (1994) The winds of (evolutionary) change: Breathing new life into microbiology. J. Bacteriol. 176, 1–6.


Ramirez, C., Kopke, A. K. E., Yang, C.-C., Boeckh, T. & Matheson, A. T. (1993) Chapter 14: The structure, function and evolution of archaeal ribosomes. In The Biochemistry of Archaea (Archaebacteria) , eds. Kales, M., Kushner, D. J. & Matheson, A. T. (Elsevier, Amsterdam), pp. 439–466.


Schopf, J. W. (1994) Proc. Natl. Acad. Sci. USA 91, 6735–6742.

Schwartz, R. M. & Dayhoff, M. O. (1978) Origin of prokaryotes, eukaryotes, mitochondria and chloroplasts. Science 199, 395–403.

Simpson, G. G. (1944) Tempo and Mode in Evolution (Columbia Univ. Press, New York), pp. xxix-xxx.

Smith, M. W., Feng, D.-F. & Doolittle, R. F. (1992) Evolution by acquisition: the case for horizontal gene transfer. Trends Biochem. Sci. 17, 489–493.



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