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The relationship between the maximal extractable SOD activity of leaves and their position on the stem of WT (open bars) and transformed poplars overexpressing FeSOD (line 6 SOD [closed bars]). Position 1 contained the youngest green leaf on the stem, whereas leaf 16 was the oldest mature leaf. Leaf 3 was the youngest mature leaf on the stem when leaf 16 showed no sign of senescence, such as decreased total leaf-extractable soluble protein. U, Units; prot, protein.
