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In vitro protease activity at different germination stages. NV: Nongerminated acorns after 4 weeks of germination. T1: mature acorns prior to germination. T2, T3, T4: Germinated acorns when root tips were visibly emerging from cotyledons (T2), their size reached 6.5 mm (T3) and it exceeded 20 mm (T4). Different letters denote significant differences between germination stages in each tissue.
