Factors affecting the concordance between orthologous gene trees and species tree in bacteria

Table 1 Functional classification and percentage of genes in each functional category

Category	This data set	COG database	Stochastic error
Information storage and processing	34%	15%	0.36
Cellular processes and signaling	24%	18%	0.37
Metabolism	31%	28%	0.15*
Poorly characterized	12%	40%	0.49

Percentage of orthologous genes and COG database genes distributed across the four broad functional categories. The fourth column shows the correlation between gene size and the percentage of common bipartitions for each category. * This correlation was not significant.

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