Table 2

Constraints of topologies on the co-origins of motif constituents

motif c

The total number

Age homogeneity rate (%) a

Age homogeneity ratio b


Real network

Average of 1000 random networks


5611

43.11

29.51

1.46

50536

22.60

10.12

2.23

2620

39.58

10.05

3.94

400510

10.03

3.63

2.77

331797

13.71

3.65

3.76

4746

16.90

3.65

4.63

55692

24.53

3.64

6.74

5748

35.11

3.66

9.58

1315

39.92

3.61

11.05

504884

11.37

1.32

8.64

4237

12.20

1.33

9.19

399622

13.39

1.33

10.05

71141

18.79

1.34

14.01

9125

31.93

1.34

23.90

632

40.82

1.28

31.87


a Age homogeneity rate is referred to as the fraction of the motifs whose constituents are of the same age class. b Age homogeneity ratio is defined as the ratio of the age homogeneity rate of the real network to its random expectation which is calculated as the average age homogeneity rate of the 1000 random networks (the fourth column). c Considering the length limitation of the table, here we only show six representative kinds of topology for 5-motif. Actually for all possible topologies of 5-motifs, the results are consistent (additional file 1: Table S10).

Liu et al. BMC Evolutionary Biology 2011 11:133   doi:10.1186/1471-2148-11-133

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