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Invertase activity in sink and source tissues of wild-type and cytokinin-deficient tobacco plants. Data represent mean values ±SD (n=6). Representative results from three independent experiments are shown. Pairwise Student's t-test was used to compare values with the wild type. *, P < 0.05; **, P < 0.01. C, Cytosolic; CW, cell wall; V, vacuolar; WT, wild type.
