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Table 1 Features of endosymbiont and organelle genomes. '*' – no genome of free-living relative, '?' – not determined.

From: Comparative rates of evolution in endosymbiotic nuclear genomes

Organism Genome Compacted (compared to free-living relative) AT bias Codon Bias Expression bias (highly expressed genes are less divergent and GC rich) Divergent (compared to free-living relative)
Organelle genomes of prokaryotic origin Mitochondria Y Y Y Y Y
  Plastids Y Y Y Y Y
Prokaryotic obligate intracellular symbionts Wolbachia Y Y Y Y Y
  Wigglesworthia Y Y Y Y Y
  Buchnera Y Y Y Y Y
Organelle genomes of eukaryotic origin Guillardia theta nm Y Y ? ? Y
  Bigelowiella natans nm Y Y ? ? Y
Eukaryotic obligate Intracellular parasites Plasmodium -* Y Y Y -*
  Toxoplasma -* Y ? ? -*
  Cryptosporidium -* No ? ? -*
  E. cuniculi Y No ? ? Y