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Averaged level of expression (±standard error of the mean) of parental (black bars) and duplicated (gray bars) genes in testis (T), ovary (O), and whole D. melanogaster body (W). The data were also divided in families with (right) and without (left) genes with testis-specific expression. Dotted gray bars indicate whole genome average level of expression in different tissues. Asterisk: P < 0.0001.
