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Table 1
Predicted and experimentally determined numbers of proteins present in mitochondria
	Yeast	Reference	Human	Reference	Arabidopsis	Reference

Predictions*
Total	423	[29]	734	[17]	800	[20]
	584	[17]	1,500	[30]
	630	[11]
Prediction percentage^†	10-13%	[10,11]	10%	[9]	10%	[9]
Extrapolated^‡	617-802		3,500		2,800

Experimental
Total	179	[13]	615	[7]	135	[14,15,18,20,31]
	388	[32]
	466	[12]
Experimental percentage^§	2.9%		1.76%		0.48%
	6.3%
	7.6%

*Predictions of the number of mitochondrial proteins are from sequence homology, targeting sequences, phylogenetic profiling or extrapolation from a set of experimental values. ^†Prediction percentage: the percentage of genes in the genome predicted to encode mitochondrial proteins from targeting analyses or phylogenetic profiles; ^‡Extrapolated: the total number of mitochondrial proteins predicted from the percentage value given and the genome size of each organism. ^§Experimental percentage: the percentage of the predicted proteome found in experimentally determined mitochondrial proteomes.
Heazlewood et al. Genome Biology 2003 4:218 doi:10.1186/gb-2003-4-6-218

Table 1