highly significantp = 7.69 × 10 -14
Indeed, the enrichment for self-interaction among WGD genes compared to singletons is highly significant (χ 2 = 55.88, df = 1, p = 7.69 × 10 -14 ), but so too is the enrichment among SSD-duplicated genes (χ 2 = 19.92, df = 1, p = 8.08 × 10 -6 ).