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Table 2 Numbers of probe sets showed either decrease of increase in gene expression comparing within and between the MZ pairs. 2A/2B and 3A/3B are the discordant pair for BMD, and 1A/1B is the concordant pair.

From: Variations in genome-wide gene expression in identical twins – a study of primary osteoblast-like culture from female twins discordant for osteoporosis

Comparison Changes   No. of probe (% of total)
   Twin 1B 2B 3B
Within pair Decrease* 1A 417 (1.8%)   
   2A   90 (0.4%)  
   3A    133 (0.6%)
   Twin 1B 2B 3B
  Increase* 1A 283 (1.3%)   
   2A   45 (0.2%)  
   3A    59 (0.3%)
  Total Twin 1B 2B 3B
   1A 700 (3.1%)   
   2A   135 (0.6%)  
   3A    192 (0.9%)
Between pair   Twin 2A 2B  
  Total 1A 791 (3.6%)   
   3A   1251 (5.9%)  
   3B 1150 (5.6%) 1114 (5.2%)  
  1. * Decrease or increase is referred to 1B, 2B and 3B who had higher BMD than 1A, 2A and 3A respectively.