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into two taxonomic groups:

# Karyotes (that include eukaryotes and proto-eukaryotic organisms such as eocytes)
# Parkaryotes (that consist of eubacteria and archaea such as halobacteria and methanogens)

In 1990, Woese, Otto Kandler, and Mark Wheelis showed that archaea are a distinct group of organisms and that eocytes (renamed Crenarchaeota as a phylum of Archaea but corrected

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