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Figure 3


Fig. 3. Sperm motility suppression by the presence of an egg. Trajectories of sperm heads of Acropora digitifera were recorded by modulating the sensitivity of a CCD camera under dark-field illumination. Swimming speed was calculated from the length of trajectory determined using NIH Image. (A) Trajectories of sperm motility are shown with and without eggs. (B) Percentages of sperm motility. (C) Swimming speed. Other Acropora species showed similar patterns. Scale bars, 50 µm. Values are mean ± s.d. (N=150 sperm from three individuals).





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