Table 2 (panels A, B).

Panel A: Comparison of the percentage of shared peptides observed in a P. furiosus experiment and an S.cerevisiae experiment. Shared peptides are defined as identified peptides whose amino acid sequence is shared by two or more proteins in the database. The P. furiosus data set shows a level of redundancy that is an order of magnitude less than that of S. cerevisiae (0.9% vs. 10.4% shared peptides).

Organism	Identified peptides	Unique peptides	Shared peptides	Percent shared
P. furiosus	12,251	12,136	115	0.9%
S. cerevisiae	7,786	6,977	809	10.4%

Panel B: Results of a P. furiosus proteomics experiment analyzed with a concatenated protein database formed by adding a decoy organism protein database to that of P. furiosus. Regardless of the decoy protein database added we identify 1,260 unique P. furiosus proteins and 4 redundant P. furiosus proteins. In addition a very small number of identified peptides (1 to 3, depending on the decoy database) have amino acid sequences shared with decoy organism proteins.
Decoy Organism	Unique P. furiosus peptides	Redundant P. furiosus peptides	Decoy organism proteins
S. cerevisiae	1,260	4	3
E. coil	1,260	4	1
H. sapiens	1,260	4	1