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Possible pathways from the retina to the suprachiasmatic nucleus (SCN) relaying in the dorsal raphe nucleus (DRN) were investigated in rats using combined anterograde and retrograde tracing with immunohistochemistry. After injection of wheat germ agglutinin-conjugated horseradish peroxidase-colloidal gold complex into the SCN, many neurons were retrogradely labeled in the middle levels of the DRN...
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