Table 1 

Topological parameters for the metabolic networks of E. coli and Buchnera APS 

Bacterium (model) 
Reaction graph 
Goodness of fit of node distribution^{2} 



Path length^{1} 
Compound graph 
Reaction graph 



Mode 
Max. path length 
No. of unreachable nodes/total no. of nodes (%) 
Indegree 
Outdegree 
Total 
Indegree 
Outdegree 
Total 



Buchnera iGT196 
8 
25 
19,493/55,932 (34%) 
1.622 (0.448) 
2.020 (0.211) 
1.700 (0.487) 
2.411 (0.115) 
2.327 (0.114) 
1.701 (0.344) 
E. coli iJR904 
6 
19 
108,467/369,056 (29%) 
1.911 (0.222) 
1.905 (0.212) 
1.622 (0.448) 
2.104 (0.127) 
2.114 (0.112) 
1.623 (0.333) 


^{1 }number of reactions between every pair of metabolites. ^{2 }Indegree is the number of substrates and outdegree is the number of products for the reaction graph. The value of gamma is shown with the KolmogorovSmirnov statistic in parentheses, with critical values (α = 0.01) of 0.050 for E. coli and 0.110 for Buchnera. 

Thomas et al. BMC Systems Biology 2009 3:24 doi:10.1186/17520509324 