Table 2

Mean repeat size in base pairs per window of 0.250 megabases in each human chromosome analyzed.

Human chromosome

Mean number of repeats in B bands

Mean number of repeats in E bands

Mean number of repeats in FS bands

Mean number of repeats in no-FS bands

1

3,338.28

3,467.81

3,647.44**

3,213.66**

2

3,166.83

3,314.78

3,343.16

3,261.81

3

2,523.47**

3,104.42**

2,807.56

3,042.48

4

2,884.52

3,101.81

3,267.70

2,966.80

5

3,012.61

3,114.22

3,335.30*

2,943.73*

6

3,286.71

3,039.27

3,220.15

3,056.08

7

3,799.18

3,571.16

5,060.35**

2,830.71**

8

3,693.84*

3,065.77*

3,552.78*

3,118.19*

9

4,018.38

3,375.42

2,877.28

3,604.23

10

3,232.03

3,437.11

3,098.81*

3,651.40*

11

3,440.03

3,269.92

3,971.77**

3,017.47**

12

3,419.76

3,715.78

4,456.85**

3,112.39**

13

2,994.29

2,959.70

2,876.41

3,014.15

14

3,252.94

3,112.29

2,689.67*

3,267.68*

15

2,789.40*

3,302.97*

2,960.15

3,212.32

16

6,114.65**

4,414.38**

4,669.36

4,553.13

17

2,279.38**

4,346.49**

3,546.25*

4,314.01*

18

2,675.72*

3,175.75*

3,074.19

3,045.68

19

-

8,377.27

8,889.31

8,050.54

20

3,875.58

3,548.22

2,952.96*

3,755.64*

21

3,199.52*

5,062.95*

-

3,924.18

22

-

5,533.07

6,132.57*

5,020.60*

Total

3,237.46**

3,501.78**

3,735.08**

3,333.41**

Tukey-Kramer tests were calculated to evaluate the statistical difference among means in each chromosome and in the whole genome. In chromosomes 19 and 22 all bands are E bands and so no test is performed. No fragile sites have been described in the literature for human chromosome 21. Significant differences among band types are indicated as follows: *P = 0.05; **P = 0.002 (after Bonferroni correction applied to 22 samples). B bands, non-evolutionary bands; E bands, evolutionary bands; FS bands, bands containing fragile sites; no-FS bands, bands without fragile sites.

Ruiz-Herrera et al. Genome Biology 2006 7:R115   doi:10.1186/gb-2006-7-12-r115