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Proportion of swollen, viable, motile, and dropletless sperm cells from bank vole males treated with two aluminum solutions (Al I = 3 mg/l and Al II = 200 mg/l) or deionized water (C = 0 mg/l). Means bearing the same letter differ significantly; A–F p < 0.01; a, b p < 0.05. Means ± SE
