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Far-UV CD of α-amylase in the presence of varied concentrations of leaf extracts from: (A) AV-20-T1, (B) AV-20-T2; (C) SM-20-T1, (D) SM-20-T2, (E) TO-20-T1, and (F) TO-20-T2. Plants were produced with nitrogen fertilizer (20 kg N/ha), which was applied at (T1) or after (T2) planting.
