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Daily changes in the melatonin levels of membrane, cytosol, mitochondria, and nuclei from rat cerebral cortex of sham-operated (SPx) and pinealectomized (Px) rats. Animals were maintained in a 12:12 h cycle and killed at the indicated hours. Black bars indicate the night period. ** p < 0.01 and *** p < 0.001 vs. SPx
