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Annexin V/PI labeling. Density plot shows non-altered spermatozoa (lower left quadrant), PI-negative spermatozoa with exposed PS (lower right quadrant), PI-positive spermatozoa without exposed PS (upper left quadrant) and PI-positive spermatozoa with exposed PS (upper right quadrant). PI, propidium iodide; PS, phosphatidylserine.
