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SbSnRK1 and PKIN1 phosphorylation in potato tubers stored at 4°C for 30 d detected by western-blot analysis with a phospho-specific antibody. Each density was normalized to the corresponding β-actin density and averaged from three replicates. The density of cv E3 was taken as 1 for the comparisons. **, P < 0.01 by Student’s t test.
