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Table 3 Evolutionary course of pairs among different groups

From: Functional importance of different patterns of correlation between adjacent cassette exons in human and mouse

   conserved duplication repeats Exon age difference *
      Upstream young equal Upstream old
human mouse ME 18 (30.0%) 24 (40.0%) 8 (13.3%) 17 33 10
  IND 16 (1.41%) 29 (2.55%) 356 (31.3%) 419 460 258
  LNK 40 (4.18%) 25 (2.61%) 55 (5.74%) 125 741 91
  ME 18 (30.0%) 25 (41.7%) 6 (10.0%) 18 31 11
  IND 18 (4.25%) 6 (1.42%) 100 (23.6%) 154 195 75
  LNK 56 (10.1%) 11 (2.17%) 12 (2.37%) 74 389 44
  1. * Each exon in the adjacent pairs is assigned an age label: "young", "middle" and "old". The "Upstream young" means the number of pair in which the upstream exon is younger than the downstream one. The "equal" means the number of pair in which the two exons are of equal age. The "Upstream old" means the number of rest pair with an older upstream exon.