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Gene duplication among cotton PERK genes including G. hirsutum (At and Dt sub-genome), G. arboreum (A-genome) and G. raimondii (D-genome). Green lines exhibited orthologous/paralogous pairs. At01-At13 (orange blocks) indicated chromosomes of At sub-genome and Dt01-Dt13 (dark green blocks) represented chromosomes of Dt sub-genome. Similarly, A-01 to A-13 (yellow blocks) and D-01 to D-13 (light blue blocks) represented G. arboreum and G. raimondii chromosomes, respectively.
