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Prediction of a number of duplicated gene pairs involved in different combinations from four Gossypium species. Gh represents G. hirsutum, Gb represents G. barbadense, Ga represents G. arboreum, Gr represents G. raimondii. Different colors represent Ka/Ks gene pairs between Gb-Gb, Gr-Ga, Gr-Gr, Ga–Ga, Gh-Gb, Gh-Gh, Gh-Gr, Gb-Gr, Gb-Ga.
