Abstract
The hypothalamic suprachiasmatic nucleus and the thalamic pregeniculate nucleus (which includes the intergeniculate leaflet) comprise the circadian visual system in the primate brain. In this study, we used intraocular injections of cholera toxin subunit B to identify those nuclei in the common marmoset brain, and demonstrated that calbindin D-28k immunoreactivity apparently labels most neurons in both the suprachiasmatic and pregeniculate nuclei. These data suggest that calbindin D-28k could represent a reliable neuronal marker for structures of the circadian visual system in marmosets and provide anatomical information on the primate equivalent of the rodent intergeniculate leaflet.
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