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pH variation over time in different media used for ovarian tissue transportation. Ovarian fragments of 1 × 1.5 × 0.5 cm were stored at 4 °C in 10 mL of IVF medium, L-15, or NaCl for the indicated times, at which pH values were measured using a pH meter (n = 9). Asterisk indicates p < 0.05 at the same time points
