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Relative cone opsin gene expression across sex. Relative expression of cone opsin genes (means ± SEM) in females (gray) and males (white), M. auratus (left) and P. taeniolatus (right). Female and male M. auratus, but not P. taeniolatus, differed significantly in the expression of the RH2b and RH2a opsin genes. See Additional file 2 for detailed t-test results and Additional file 3 for primer specifications for cone opsin genes.
