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Enzyme activities and lactate levels in invertase and Suc phosphorylase-expressing tubers. Activities of: A, invertase; B, Suc phosphorylase; C, GAP-DH; D, ADH; E, LDH; and levels of: F, lactate. Results are means ± se (n = 4 separate tubers from different plants). Error bars are not shown when they are smaller than the symbol. Significant changes from the wild type are marked with an asterisk (P < 0.05 using the Student's t test).
