Table I. Statistics of protein-protein interaction data in different WGD categories.

WGD	Total No. of Gene Pairs	No. of Genes That Have Interactors	No. of Gene Pairs in Which Only a Single Gene Has Interactors	No. of Gene Pairs in Which Both Genes Have Interactors	No. of Duplicate Gene Pairs Interacting with Each Other	No. of Gene Pairs Showing Dosage Balancea
α	3,614	1,822	894	464	69	871
β	1,451	721	397	162	24	187
γ	521	285	133	76	17	49

^aThe number of gene pairs whose interaction partner maintains the duplication status from the same WGD event.