The gene ontology (GO) term enrichment analysis was performed using the “elim” algorithm implemented in the “topGO” R package (http://www.bioconductor.org/packages/2.12/bioc/html/topGO.html), with a significance threshold of 0.05 using the genes from all ohnolog-tetrad categories as the background. GO terms were assigned to salmon genes using Blast2GO (Conesa et al. 2005).
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