Figure 5From: The origin and early evolution of eukaryotes in the light of phylogenomicsThe two alternative scenarios of eukaryogenesis. (a) The archaezoan scenario; (b) the symbiogenesis scenario. The putative archaeal or archaezoan hosts of the α-proteobacterial endosymbiont are shown with elements of their cytoskeleton and cell division apparatus colored as in Figure 4.Back to article page