EUKARYOTIC HOMOLOGS ANTICIPATED. “We might expect to find closer and closer homologs of components of the several eukaryote-specific cellular machineries [now called eukaryotic signature proteins] as we explore inferred proteomes of such archaea [the group of phyla comprising Thaumarchaeota, Aigarchaeota, Crenarchaeota, and Korarchaeota (TACK)].”
http://www.pnas.org/content/112/33/10278.full