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Table 2 Position of the interruption in imperfect SSR.

From: Simple sequence repeat variation in the Daphnia pulex genome

  Homopolymers
Repeat Size End (obs) Middle (obs) End (exp) Middle (exp) p-value
3 15,005 50 10,037 5,018 0
4 5,793 1,392 3,593 3,593 0
5 2,549 1,168 1,487 2,230 5.E-277
6 1,309 735 681 1,363 1.E-190
7 810 492 372 930 5.E-159
8 447 294 185 556 3.E-109
9 459 253 158 554 7.E-162
10 350 285 127 508 2.E-108
11 178 191 67 302 1.E-50
12 119 167 48 238 1.E-29
13 65 121 29 157 1.E-13
14 45 107 22 130 7.E-08
15 34 77 15 96 8.E-08
16 18 43 8 53 6.E-05
17 12 40 6 46 1.E-02
18 6 28 4 30 2.E-01
19 3 23 3 23 9.E-01
20 6 15 2 19 5.E-03
  Dimers
Repeat Size End (obs) Middle (obs) End (exp) Middle (exp) p-value
3 1,588 641 1,486 743 5.E-06
4 332 208 270 270 9.E-08
5 121 83 82 122 2.E-08
6 65 61 42 84 1.E-05
7 58 53 32 79 3.E-08
8 47 29 19 57 1.E-13
9 39 30 15 54 7.E-12
10 17 10 5 22 2.E-08
11 11 7 3 15 2.E-06
12 9 7 3 13 2.E-05
13 7 4 2 9 9.E-06
  1. This table shows the position of interruptions in simple sequence repeats. "End" indicates polymorphism at beginning or end of SSR loci, while middle variation indicates polymorphism occurs at interior positions (eg. Homopolymer with repeat length of three has two possible end nucleotide positions and one possible middle position. P-value is determined using Pearson's chi-square test for random expectation.