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Representative autoradiographs showing daily Period gene mRNA levels in the suprachiasmatic nucleus (SCN) of the diurnal degu. Brains were sampled every 2 h from animals housed in 12:12-h light-dark (LD) periods. Period gene mRNA levels in the SCN at each time point were visualized using in situ hybridization and autoradiography. Depicted are coronal slices labeled for degu Per1, Per2, and Per3 mRNA.
