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Mitochondrial packing shows a marginal but significant increase with mid-piece length up to 28 µm. Sperm trait genotype, which is a determinant of mid-piece length (boxplots top), did not affect mitochondrial packing (boxplots right). The data in light grey are from AA genotype males (n = 5, 20 measures each) and data in dark grey are from AB genotype males (n = 5, 20 measures each). The diamond-shaped points represent the mean values for every male.
