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Expression of circadian clock genes in barley cv. Sonja entrained to temperature cycles in constant dark. Relative expression of circadian clock genes in 5-d-old barley seedlings, cv. Sonja, grown in constant dark with a daily temperature range of 16–25.5 °C. (A). Daily temperature range for the duration of the experiment. (B–D). Expression of circadian clock genes. Values are means of three biological replicates ±standard error.
