... mechanism to increase the complexity of proteomes is the editing of transcripts (both in nuclearand organelle genomes) [4,5]. Dual targeting of proteins does not increase the number of proteins in acell, ... system usedby proteins involved in photosynthesis [36]. The Toc1 59 family in Arabidopsis consists of four proteins: Toc1 59, Toc1 32, Toc1 20 and Toc 90 [37]. It is possiblethat one of these members ... compete for the import of GR intomitochondria, and some but not all other mitochon-drial proteins tested, suggesting that it plays some role in import of GR on the cytosolic surface of the outermembrane....