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Table 1 2 × 2 contingency table obtained by classifying genes into 2 categorical variables. The letters denote the number of genes for a given category (e.g., “a” denotes the number of retained genes annotated with the tested GO category)

From: The Aquilegia genome reveals a hybrid origin of core eudicots

Retainedaba + b*
Not-retainedcdc + d
Suma + cb + dN = total number of genes
   =29,550 (across 7 chromosomes)
  1. *equal to 1302 and 6972 for candidate WGD-derived paralogs and tandem gene duplicates, respectively