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Table 6 Numbers of evolutionary breakpoint intervals on chromosomes 1 – 22, length of the respective chromosomes and gene density.

From: Gene synteny comparisons between different vertebrates provide new insights into breakage and fusion events during mammalian karyotype evolution

Chromosome Number of evolutionary breakpoint intervals per chromosome Chromosome length (bp) a Number of protein-coding genes per chromosome a Gene density (genes/100 kb) Breakpoint density (breakpoint interval/100 kb)
1 47 247,249,719 2189 8.85 0.19
2 46 242,951,149 1328 5.47 0.19
3 45 199,501,827 1112 5.57 0.23
4 21 191,273,063 797 4.17 0.11
5 42 180,857,866 903 4.99 0.23
6 28 170,899,992 1133 6.62 0.16
7 37 158,821,424 1023 6.44 0.23
8 30 146,274,826 747 5.11 0.21
9 20 140,273,252 929 6.62 0.14
10 20 135,374,737 834 6.16 0.15
11 31 134,452,384 1385 10.30 0.23
12 18 132,349,534 1080 8.16 0.14
13 9 114,142,980 361 3.16 0.08
14 11 106,368,585 669 6.29 0.10
15 16 100,338,915 641 6.39 0.16
16 12 88,827,254 925 10.41 0.13
17 31 78,774,742 1236 15.69 0.39
18 11 76,117,153 295 3.88 0.14
19 17 63,811,651 1443 22.61 0.27
20 20 62,435,964 617 9.88 0.32
21 6 46,944,323 284 6.05 0.13
22 9 49,691,432 519 10.44 0.18
  1. a: according to the Ensembl database, version 47.36i. The gene density per chromosome was found to be correlated with the number of breakpoint intervals (r = 0.60; p = 0.0031).