There are a number of papers which have characterized the general mitochondrial proteome.34???37 Data from these studies are complied in databases such as MitoCarta (http://www.broadinstitute.org/pubs/MitoCarta/index.html), MitoP38 (http://www.mitop.de:8080/mitop2/), and Mitominer39 which list proteins identified as mitochondrial (using GFP, proteomic 2D gel and MS, and other methods).