Tom22, an 8-kDa trans-Site receptor in plants and protozoans, is a conserved feature of the Tom complex that appeared early in the evolution of eukaryotes - Macasev, Diana; Whelan, James; Newbigin, Ed; Silva Filho, Márcio de Castro; Mulhern, Terrence D.; Lithgow, Trevor (Molecular Biology and Evolution, 2004)