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Hit numbers (copy numbers) in the genome and expression level of the sex-differentially expressed piRNAs (739). Hit numbers of piRNAs ranged from 1 to 202 (blue dots, y-axis on the left). The expression level of each piRNA is shown in signal intensity (1.58–64,019.26) on the right (red dots, y-axis). The x-axis indicates piRNAs.
