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Expression of plastid Cpn60 genes in response to heat stress. Seedlings (14-d-old) first grown in soil at constant 27°C were subjected to 42°C. Their third leaves were sampled during treatment (15, 30, 60, and 120 min) and in recovery (2 h after end of exposure period, when returned to 27°C). UBQ5 was internal control. Error bars indicate standard deviations; n = 3.
