Eukaryote evolution: Engulfed by speculation

@article{Poole2007EukaryoteEE,
  title={Eukaryote evolution: Engulfed by speculation},
  author={Anthony M. Poole and David Penny},
  journal={Nature},
  year={2007},
  volume={447},
  pages={913-913}
}
The notion that eukaryotes evolved via a merger of cells from the other two domains — archaea and bacteria — overlooks known processes. It is generally agreed that the mitochondrion, powerhouse of the eukaryote cell, evolved from an engulfed bacterium. But what did the engulfing? Did an archaeon engulf a bacterium? Did an RNA cell engulf an archaeon and a mitochondrial ancestor? The permutations are seemingly endless. Anthony Poole and David Penny argue that in this field, speculation has run… 
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