The nature of the host in the origin of the eukaryote cell.
D000332:Aerobiosis; D002454:Cell Differentiation; D002462:Cell Membrane; D002467:Cell Nucleus; D003593:Cytoplasm / Q000378:metabolism; D005809:Genes, Regulator; D008928:Mitochondria / Q000378:metabolism; D010085:Oxidative Phosphorylation; D011995:Recombination, Genetic; D012287:Rickettsiaceae