Table 2 

Basic graph properties 

Reference 
Nonparasites 
Parasites 
Random 



Nodes 
876 
483 ± 52 
287 ± 67 
333 ± 8.6 
Edges 
1184 
539 ± 79 
278 ± 80 
279 ± 7.0 
Density 
0.0031 
0.0046 ± 0.0003 
0.0070 ± 0.001 
0.0049 ± 0.0002 
Avg. Connectivity 
2.7 
2.2 ± 0.1 
1.9 ± 0.1 
1.7 ± 0.0 
Max. Connectivity 
18 
11.3 ± 1.5 
8.3 ± 0.7 
7.2 ± 1.5 
Avg. Path length 
4.7 
2.9 ± 0.44 
1.2 ± 0.89 
0.12 ± 0.07 
Max. Path length (diameter) 
24 
25.6 ± 1.1 
22.7 ± 7.1 
15.4 ± 3.9 
Global clustering coefficient 
0.079 
0.059 ± 0.009 
0.039 ± 0.014 
0.015 ± 0.006 
Isolated edges 
17 
50 ± 9 
51 ± 4 
74 ± 6 


Basic graph parameters (± standard deviation) of the reconstructed core metabolic networks, the randomly shrunk networks, and the reference network of all core metabolic reactions. Network density is the proportion of observed to total possible links, connectivity is the number of links per node, path length refers to the shortest distance connecting two nodes, and the global clustering coefficient is the number of closed triplets (triangles) over the total number of triplets. 

Nerima et al. BMC Genomics 2010 11:217 doi:10.1186/1471216411217 