Gene coexpression clusters and putative regulatory elements underlying seed storage reserve accumulation in Arabidopsis

Table 2 Network characteristics in the Arabidopsis seed coexpression network.

Total number of genes in the network	11,698
Mean number of connections per gene	160
Median number of connections per gene	71
Maximum connections	367
Clustering coefficient ^a	0.73
Scale-free topology criterion ^b	0.68
Gamma ^c	1.34

Network properties were analysed according to the methods in [40]. ^a The clustering coefficient measures the "small-world" property in the network, which is the likelihood that two genes connected to a common gene are also connected to each other [54]. ^b The scale-free topology criterion is used to measure the topological similarity of a network to other biological networks. Its value ranges from 0 to 1, with 1 representing networks that are most like other biological networks [55]. ^c Gamma is the measurement of power-law distribution in a network [56], which consists of many genes with relatively few connections and a few genes (hubs) with many connections; a gamma < 3 indicates that a network exhibits such a distribution [40].

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