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Effect of various GSH concentrations on SPM of frozen-thawed canine spermatozoa. Mean ± SEM. Four to seven replicate experiments were performed (control, n = 7; 2.5 mM, n = 4; 5 mM, n = 4; 7.5 mM, n = 5; and 10 mM, n = 4). Different letters (a–c) indicate significant differences at each time point (P < 0.05).
