(A) Diurnal expression of <i>Per1</i> (upper panel), <i>Per2</i> (middle panel) and <i>Bmal1</i> (lower panel), genes.

<p>The expression was analyzed in the striatum, cingulate, motor and somatosensory areas of cerebral cortex and the SCN of wild type (light gray dots, n = 6) and <i>Hrh1</i>^<i>-/-</i> (black dots, n = 7) mice at ZT6 and ZT14 housed under LD12/12 cycle. (B) Corresponding autoradiograms.