Overview
Asgard archaea, or Promethearchaeati, are a kingdom belonging to the domain Archaea that contain eukaryotic signature proteins. It appears that the eukaryotes, the domain that contains the animals, plants, fungi and protists, emerged within the Promethearchaeati, in a branch containing the "Heimdallarchaeia". This supports the two-domain system of classification over the three-domain system.