Overlap between the five metabolic pathway databases for the comparison of the core metabolic processes. The dark green bars give the percentage of entities (genes, EC numbers, metabolites and reactions) that are part of the consensus in the comparison restricted to the following six categories: amino acid metabolism, carbohydrate metabolism, energy metabolism, lipid metabolism, metabolism of cofactors and vitamins, and nucleotide metabolism. The majority score is given by the combined percentages of the dark green, light green (4 out of 5 databases agree) and yellow (3 out of 5) bars. The orange bars indicate the percentage of entities that can only be found in 2 databases. The percentage of unique entities is indicated by the red bars. In matching the reactions we did not take into account e-, H+ and H2O.