Fig. 1

The HDB is downstream of the SCN. A A simple diagram of the experimental procedure. B Schematic of the injection of cholera toxin subunit B-488 into the HDB of C57BL/6J mice. C Localization of cholera toxin subunit B-488 in the HDB. The HDB, MCPO and SI are subregions of the BF. The scale bar represents 250 μm. D The cell bodies of neurons were labeled in the SCN. The upper right is an enlargement of the area within the red dotted square in the center. The scale bar represents 100 μm